diff --git a/pkg/cryptoauthlib/include/atca.h b/pkg/cryptoauthlib/include/atca.h
index 75109c2630b7..abfc8e048c14 100644
--- a/pkg/cryptoauthlib/include/atca.h
+++ b/pkg/cryptoauthlib/include/atca.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_cryptoauthlib
  * @{
@@ -17,9 +19,6 @@
  *
  */
 
-#ifndef ATCA_H
-#define ATCA_H
-
 #include "periph/i2c.h"
 #include "cryptoauthlib.h"
 
@@ -74,5 +73,4 @@ typedef struct {
 }
 #endif
 
-#endif /* ATCA_H */
 /** @} */
diff --git a/pkg/cryptoauthlib/include/atca_config.h b/pkg/cryptoauthlib/include/atca_config.h
index da93b09a49fb..5676a86e7d10 100644
--- a/pkg/cryptoauthlib/include/atca_config.h
+++ b/pkg/cryptoauthlib/include/atca_config.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_cryptoauthlib
  * @{
@@ -18,9 +20,6 @@
  *
  */
 
-#ifndef ATCA_CONFIG_H
-#define ATCA_CONFIG_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -48,5 +47,4 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-#endif /* ATCA_CONFIG_H */
 /** @} */
diff --git a/pkg/cryptoauthlib/include/atca_params.h b/pkg/cryptoauthlib/include/atca_params.h
index 4058be52b80a..6264a53d7fa1 100644
--- a/pkg/cryptoauthlib/include/atca_params.h
+++ b/pkg/cryptoauthlib/include/atca_params.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_cryptoauthlib
  * @{
@@ -17,9 +19,6 @@
  *
  */
 
-#ifndef ATCA_PARAMS_H
-#define ATCA_PARAMS_H
-
 #include "board.h"
 #include "periph/i2c.h"
 #include "atca.h"
@@ -124,5 +123,4 @@ extern ATCADevice atca_devs_ptr[ATCA_NUMOF];
 }
 #endif
 
-#endif /* ATCA_PARAMS_H */
 /** @} */
diff --git a/pkg/cryptoauthlib/include/atecc608a_config.h b/pkg/cryptoauthlib/include/atecc608a_config.h
index be77d7b6e781..233671ebab5f 100644
--- a/pkg/cryptoauthlib/include/atecc608a_config.h
+++ b/pkg/cryptoauthlib/include/atecc608a_config.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @file
  * @brief       Example configuration for Microchip CryptoAuth devices
@@ -26,9 +28,6 @@
  *
  */
 
-#ifndef ATECC608A_CONFIG_H
-#define ATECC608A_CONFIG_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -112,5 +111,3 @@ const uint8_t atecc608a_config[] = {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* ATECC608A_CONFIG_H */
diff --git a/pkg/cryptoauthlib/include/cryptoauthlib_test.h b/pkg/cryptoauthlib/include/cryptoauthlib_test.h
index bbb2d7aa248b..87511598a02a 100644
--- a/pkg/cryptoauthlib/include/cryptoauthlib_test.h
+++ b/pkg/cryptoauthlib/include/cryptoauthlib_test.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_cryptoauthlib
  * @{
@@ -16,9 +18,6 @@
  *
  */
 
-#ifndef CRYPTOAUTHLIB_TEST_H
-#define CRYPTOAUTHLIB_TEST_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -38,5 +37,4 @@ int atca_run_cmd(char *command, size_t len);
 }
 #endif
 
-#endif /* CRYPTOAUTHLIB_TEST_H */
 /** @} */
diff --git a/pkg/driver_bme680/include/bme680_hal.h b/pkg/driver_bme680/include/bme680_hal.h
index fbd148572ebb..54a9a8856490 100644
--- a/pkg/driver_bme680/include/bme680_hal.h
+++ b/pkg/driver_bme680/include/bme680_hal.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_driver_bme680
  * @{
@@ -16,9 +18,6 @@
  * @author      Dylan Laduranty <dylan.laduranty@mesotic.com>
  */
 
-#ifndef BME680_HAL_H
-#define BME680_HAL_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -45,5 +44,4 @@ int8_t bme680_spi_write_hal(uint8_t dev_id, uint8_t reg_addr,
 }
 #endif
 
-#endif /* BME680_HAL_H */
 /** @} */
diff --git a/pkg/driver_cryptocell_310/include/cryptocell_310_util.h b/pkg/driver_cryptocell_310/include/cryptocell_310_util.h
index c49e135f959f..7493445f864c 100644
--- a/pkg/driver_cryptocell_310/include/cryptocell_310_util.h
+++ b/pkg/driver_cryptocell_310/include/cryptocell_310_util.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_driver_cryptocell_310
  * @{
@@ -16,8 +18,6 @@
  * @author      Lena Boeckmann <lena.boeckmann@haw-hamburg.de>
  *
  */
-#ifndef CRYPTOCELL_310_UTIL_H
-#define CRYPTOCELL_310_UTIL_H
 
 #ifdef __cplusplus
 extern "C" {
@@ -68,5 +68,4 @@ void driver_cryptocell_310_terminate(void);
 }
 #endif
 
-#endif /* CRYPTOCELL_310_UTIL_H */
 /** @} */
diff --git a/pkg/driver_cryptocell_310/include/psa_cryptocell_310_aes_common.h b/pkg/driver_cryptocell_310/include/psa_cryptocell_310_aes_common.h
index 400e90d4b437..fed367d10a81 100644
--- a/pkg/driver_cryptocell_310/include/psa_cryptocell_310_aes_common.h
+++ b/pkg/driver_cryptocell_310/include/psa_cryptocell_310_aes_common.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_driver_cryptocell_310
  * @{
@@ -18,9 +20,6 @@
  *
  */
 
-#ifndef PSA_CRYPTOCELL_310_AES_COMMON_H
-#define PSA_CRYPTOCELL_310_AES_COMMON_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -69,5 +68,4 @@ psa_status_t cryptocell_310_common_aes_encrypt_decrypt(SaSiAesUserContext_t *ctx
 }
 #endif
 
-#endif /* PSA_CRYPTOCELL_310_AES_COMMON_H */
 /** @} */
diff --git a/pkg/driver_cryptocell_310/include/psa_cryptocell_310_ecc_common.h b/pkg/driver_cryptocell_310/include/psa_cryptocell_310_ecc_common.h
index 98ce0b068d46..2f040f38513e 100644
--- a/pkg/driver_cryptocell_310/include/psa_cryptocell_310_ecc_common.h
+++ b/pkg/driver_cryptocell_310/include/psa_cryptocell_310_ecc_common.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_driver_cryptocell_310
  * @{
@@ -18,9 +20,6 @@
  *
  */
 
-#ifndef PSA_CRYPTOCELL_310_ECC_COMMON_H
-#define PSA_CRYPTOCELL_310_ECC_COMMON_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -140,5 +139,4 @@ psa_status_t cryptocell_310_common_ecc_verify(const uint8_t *pub_key,
 }
 #endif
 
-#endif /* PSA_CRYPTOCELL_310_ECC_COMMON_H */
 /** @} */
diff --git a/pkg/driver_cryptocell_310/include/psa_cryptocell_310_hashes_common.h b/pkg/driver_cryptocell_310/include/psa_cryptocell_310_hashes_common.h
index aeb3a2544388..13b058a40b4e 100644
--- a/pkg/driver_cryptocell_310/include/psa_cryptocell_310_hashes_common.h
+++ b/pkg/driver_cryptocell_310/include/psa_cryptocell_310_hashes_common.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_driver_cryptocell_310
  * @{
@@ -17,8 +19,6 @@
  * @author      Lena Boeckmann <lena.boeckmann@haw-hamburg.de>
  *
  */
-#ifndef PSA_CRYPTOCELL_310_HASHES_COMMON_H
-#define PSA_CRYPTOCELL_310_HASHES_COMMON_H
 
 #ifdef __cplusplus
 extern "C" {
@@ -67,5 +67,4 @@ psa_status_t cryptocell_310_common_hash_finish(CRYS_HASHUserContext_t *ctx,
 }
 #endif
 
-#endif /* PSA_CRYPTOCELL_310_HASHES_COMMON_H */
 /** @} */
diff --git a/pkg/driver_cryptocell_310/include/psa_error.h b/pkg/driver_cryptocell_310/include/psa_error.h
index cb522406c55b..1bde0060c4b6 100644
--- a/pkg/driver_cryptocell_310/include/psa_error.h
+++ b/pkg/driver_cryptocell_310/include/psa_error.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_driver_cryptocell_310
  * @{
@@ -16,8 +18,6 @@
  * @author      Lena Boeckmann <lena.boeckmann@haw-hamburg.de>
  *
  */
-#ifndef PSA_ERROR_H
-#define PSA_ERROR_H
 
 #ifdef __cplusplus
 extern "C" {
@@ -58,5 +58,4 @@ const char *cryptocell310_status_to_humanly_readable(uint32_t status);
 }
 #endif
 
-#endif /* PSA_ERROR_H */
 /** @} */
diff --git a/pkg/driver_cryptocell_310/include/psa_periph_aes_ctx.h b/pkg/driver_cryptocell_310/include/psa_periph_aes_ctx.h
index ce0f7360c6f4..6ab7021e4228 100644
--- a/pkg/driver_cryptocell_310/include/psa_periph_aes_ctx.h
+++ b/pkg/driver_cryptocell_310/include/psa_periph_aes_ctx.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_driver_cryptocell_310
  * @{
@@ -16,8 +18,6 @@
  * @author      Lena Boeckmann <lena.boeckmann@haw-hamburg.de>
  *
  */
-#ifndef PSA_PERIPH_AES_CTX_H
-#define PSA_PERIPH_AES_CTX_H
 
 #ifdef __cplusplus
 extern "C" {
@@ -37,5 +37,4 @@ typedef SaSiAesUserContext_t psa_cipher_aes_128_ctx_t;
 }
 #endif
 
-#endif /* PSA_PERIPH_AES_CTX_H */
 /** @} */
diff --git a/pkg/driver_cryptocell_310/include/psa_periph_hashes_ctx.h b/pkg/driver_cryptocell_310/include/psa_periph_hashes_ctx.h
index c4e5f74b6e51..70f9c99d022b 100644
--- a/pkg/driver_cryptocell_310/include/psa_periph_hashes_ctx.h
+++ b/pkg/driver_cryptocell_310/include/psa_periph_hashes_ctx.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_driver_cryptocell_310
  * @{
@@ -17,9 +19,6 @@
  *
  */
 
-#ifndef PSA_PERIPH_HASHES_CTX_H
-#define PSA_PERIPH_HASHES_CTX_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -60,5 +59,4 @@ typedef CRYS_HASHUserContext_t psa_hashes_sha512_ctx_t;
 }
 #endif
 
-#endif /* PSA_PERIPH_HASHES_CTX_H */
 /** @} */
diff --git a/pkg/edhoc-c/include/edhoc_config.h b/pkg/edhoc-c/include/edhoc_config.h
index 7d37be2e9e10..cbba0edfbfcc 100644
--- a/pkg/edhoc-c/include/edhoc_config.h
+++ b/pkg/edhoc-c/include/edhoc_config.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_edhoc_c
  * @{
@@ -18,9 +20,6 @@
  * @}
  */
 
-#ifndef EDHOC_CONFIG_H
-#define EDHOC_CONFIG_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -117,5 +116,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* EDHOC_CONFIG_H */
diff --git a/pkg/esp8266_sdk/bootloader/sdkconfig.h b/pkg/esp8266_sdk/bootloader/sdkconfig.h
index 182f272a8224..800cea29f0f0 100644
--- a/pkg/esp8266_sdk/bootloader/sdkconfig.h
+++ b/pkg/esp8266_sdk/bootloader/sdkconfig.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_esp8266_sdk
  * @{
@@ -24,9 +26,6 @@
  * @author      iosabi <iosabi@protonmail.com>
  */
 
-#ifndef SDKCONFIG_H
-#define SDKCONFIG_H
-
 #if !DOXYGEN
 
 #include "riotbuild.h"
@@ -81,5 +80,4 @@ extern "C" {
 #endif
 
 #endif /* !DOXYGEN */
-#endif /* SDKCONFIG_H */
 /** @} */
diff --git a/pkg/esp8266_sdk/bootloader/sdkconfig_default.h b/pkg/esp8266_sdk/bootloader/sdkconfig_default.h
index 4e110bfaabd5..03e9b4baf351 100644
--- a/pkg/esp8266_sdk/bootloader/sdkconfig_default.h
+++ b/pkg/esp8266_sdk/bootloader/sdkconfig_default.h
@@ -1,11 +1,10 @@
+#pragma once
+
 /*
  * Generated by ./update_mk.sh, don't modify directly.
  * Default CONFIG_ parameters from the SDK package.
  */
 
-#ifndef SDKCONFIG_DEFAULT_H
-#define SDKCONFIG_DEFAULT_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -24,5 +23,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* SDKCONFIG_DEFAULT_H */
diff --git a/pkg/etl/config/etl_profile.h b/pkg/etl/config/etl_profile.h
index 97fe2d23d981..09be6f42406a 100644
--- a/pkg/etl/config/etl_profile.h
+++ b/pkg/etl/config/etl_profile.h
@@ -6,6 +6,8 @@
 * directory for more details.
 */
 
+#pragma once
+
 /**
 * @ingroup     pkg_etl
 * @brief
@@ -18,8 +20,6 @@
 *              This is configured by compiler defines the in Makefile.include
 * @author      Jens Wetterich <jens@wetterich-net.de>
 */
-#ifndef ETL_PROFILE_H
-#define ETL_PROFILE_H
 
 #ifdef __cplusplus
 extern "C" {
@@ -50,5 +50,4 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-#endif /* ETL_PROFILE_H */
 /** @} */
diff --git a/pkg/fatfs/fatfs_diskio/mtd/include/fatfs_diskio_mtd.h b/pkg/fatfs/fatfs_diskio/mtd/include/fatfs_diskio_mtd.h
index 32924c02ce35..03ea7626cdd2 100644
--- a/pkg/fatfs/fatfs_diskio/mtd/include/fatfs_diskio_mtd.h
+++ b/pkg/fatfs/fatfs_diskio/mtd/include/fatfs_diskio_mtd.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_fatfs
  * @brief
@@ -15,9 +17,6 @@
  * @author      Michel Rottleuthner <michel.rottleuthner@haw-hamburg.de>
  */
 
-#ifndef FATFS_DISKIO_MTD_H
-#define FATFS_DISKIO_MTD_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -42,5 +41,4 @@ extern "C" {
 }
 #endif
 
-#endif /* FATFS_DISKIO_MTD_H */
 /** @} */
diff --git a/pkg/flashdb/include/fal_cfg.h b/pkg/flashdb/include/fal_cfg.h
index 8884845db8e9..e3ed66539e30 100644
--- a/pkg/flashdb/include/fal_cfg.h
+++ b/pkg/flashdb/include/fal_cfg.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_flashdb
  * @{
@@ -22,9 +24,6 @@
  * @author      Benjamin Valentin <benjamin.valentin@ml-pa.com>
  */
 
-#ifndef FAL_CFG_H
-#define FAL_CFG_H
-
 #include "board.h"
 #include "macros/units.h"
 #include "mtd_default.h"
@@ -195,5 +194,4 @@ extern struct fal_flash_dev mtd_flash0;
 #ifdef __cplusplus
 }
 #endif
-#endif /* FAL_CFG_H */
 /** @} */
diff --git a/pkg/flashdb/include/fdb_cfg.h b/pkg/flashdb/include/fdb_cfg.h
index 188a027d1ae0..cfac023f1ce1 100644
--- a/pkg/flashdb/include/fdb_cfg.h
+++ b/pkg/flashdb/include/fdb_cfg.h
@@ -4,14 +4,13 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#pragma once
+
 /**
  * @file
  * @brief configuration file
  */
 
-#ifndef FDB_CFG_H
-#define FDB_CFG_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -26,4 +25,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-#endif /* FDB_CFG_H */
diff --git a/pkg/libb2/include/libb2_config.h b/pkg/libb2/include/libb2_config.h
index 6f00116c9c47..0386aec2eb09 100644
--- a/pkg/libb2/include/libb2_config.h
+++ b/pkg/libb2/include/libb2_config.h
@@ -1,5 +1,4 @@
-#ifndef LIBB2_CONFIG_H
-#define LIBB2_CONFIG_H
+#pragma once
 
 #include "cpu.h"
 
@@ -18,4 +17,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-#endif /* LIBB2_CONFIG_H */
diff --git a/pkg/libcose/include/cose/crypto/riot.h b/pkg/libcose/include/cose/crypto/riot.h
index 4c2bbc73d831..5c6e0b50a00a 100644
--- a/pkg/libcose/include/cose/crypto/riot.h
+++ b/pkg/libcose/include/cose/crypto/riot.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_libcose
  *
@@ -17,9 +19,6 @@
  * @author      Francisco Molina <francois-xavier.molina@inria.fr>
  */
 
-#ifndef COSE_CRYPTO_RIOT_H
-#define COSE_CRYPTO_RIOT_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -51,6 +50,5 @@ void libcose_crypt_init(void);
 }
 #endif
 
-#endif /* COSE_CRYPTO_RIOT_H */
 
 /** @} */
diff --git a/pkg/libschc/include/libschc/config.h b/pkg/libschc/include/libschc/config.h
index 88b9c1a72f68..b5be93f43a57 100644
--- a/pkg/libschc/include/libschc/config.h
+++ b/pkg/libschc/include/libschc/config.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_libschc_config libSCHC compile-time configuration
  * @ingroup     pkg_libschc
@@ -18,8 +20,6 @@
  *
  * @author  Martine S. Lenders <m.lenders@fu-berlin.de>
  */
-#ifndef LIBSCHC_CONFIG_H
-#define LIBSCHC_CONFIG_H
 
 #ifdef __cplusplus
 extern "C" {
@@ -68,5 +68,4 @@ extern "C" {
 }
 #endif
 
-#endif /* LIBSCHC_CONFIG_H */
 /** @} */
diff --git a/pkg/libschc/include/rules/rule_config.h b/pkg/libschc/include/rules/rule_config.h
index 139f948518ae..f45ebde82d14 100644
--- a/pkg/libschc/include/rules/rule_config.h
+++ b/pkg/libschc/include/rules/rule_config.h
@@ -16,13 +16,13 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#pragma once
+
 /**
  * @internal
  * @author  boortmans <bart.moons@gmail.com>
  * @author  Martine S. Lenders <m.lenders@fu-berlin.de>
  */
-#ifndef RULES_RULE_CONFIG_H
-#define RULES_RULE_CONFIG_H
 
 #include "rules.h"
 
@@ -33,5 +33,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* RULES_RULE_CONFIG_H */
diff --git a/pkg/libschc/include/rules/rules.h b/pkg/libschc/include/rules/rules.h
index 9374e57d8415..1aa90e26bb4a 100644
--- a/pkg/libschc/include/rules/rules.h
+++ b/pkg/libschc/include/rules/rules.h
@@ -16,13 +16,13 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#pragma once
+
 /**
  * @internal
  * @author  boortmans <bart.moons@gmail.com>
  * @author  Martine S. Lenders <m.lenders@fu-berlin.de>
  */
-#ifndef RULES_RULES_H
-#define RULES_RULES_H
 
 #include "kernel_defines.h"
 
@@ -340,5 +340,3 @@ static const struct schc_device* devices[] = { &node1, &node2 };
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* RULES_RULES_H */
diff --git a/pkg/libschc/include/schc_config.h b/pkg/libschc/include/schc_config.h
index 96cea7a8dcef..1c47a778b1c1 100644
--- a/pkg/libschc/include/schc_config.h
+++ b/pkg/libschc/include/schc_config.h
@@ -16,6 +16,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#pragma once
+
 /**
  * @addtogroup  pkg_libschc_config
  *
@@ -31,8 +33,6 @@
  * @author  boortmans <bart.moons@gmail.com>
  * @author  Martine S. Lenders <m.lenders@fu-berlin.de>
  */
-#ifndef SCHC_CONFIG_H
-#define SCHC_CONFIG_H
 
 #include <stdio.h>
 #include <unistd.h>
@@ -121,7 +121,6 @@ extern "C" {
 }
 #endif
 
-#endif /* SCHC_CONFIG_H */
 /**
  * @internal
  * @}
diff --git a/pkg/littlefs/lfs_log.h b/pkg/littlefs/lfs_log.h
index e7d18eaaf08b..0598142890dc 100644
--- a/pkg/littlefs/lfs_log.h
+++ b/pkg/littlefs/lfs_log.h
@@ -6,6 +6,8 @@
  * details.
  */
 
+#pragma once
+
 /**
  * @ingroup     sys_littlefs
  * @{
@@ -21,9 +23,6 @@
  *
  */
 
-#ifndef LFS_LOG_H
-#define LFS_LOG_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -70,5 +69,4 @@ extern "C" {
 
 /** @} */
 
-#endif /* LFS_LOG_H */
 /** @} */
diff --git a/pkg/littlefs2/lfs_log.h b/pkg/littlefs2/lfs_log.h
index 0a2b27152b01..5ebf31fcdcf5 100644
--- a/pkg/littlefs2/lfs_log.h
+++ b/pkg/littlefs2/lfs_log.h
@@ -6,6 +6,8 @@
  * details.
  */
 
+#pragma once
+
 /**
  * @ingroup     sys_littlefs2
  * @{
@@ -21,9 +23,6 @@
  *
  */
 
-#ifndef LFS_LOG_H
-#define LFS_LOG_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -91,5 +90,4 @@ extern "C" {
 
 /** @} */
 
-#endif /* LFS_LOG_H */
 /** @} */
diff --git a/pkg/lua/contrib/binsearch.h b/pkg/lua/contrib/binsearch.h
index 6db2f303911c..23b46535a9dd 100644
--- a/pkg/lua/contrib/binsearch.h
+++ b/pkg/lua/contrib/binsearch.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @internal
  * @file
@@ -41,9 +43,6 @@
  * @{
  */
 
-#ifndef BINSEARCH_H
-#define BINSEARCH_H
-
 #include <stdint.h>
 #include <errno.h>
 
@@ -133,6 +132,5 @@ const void *binsearch_str_p(const void *start, size_t offset, size_t stride,
 }
 #endif
 
-#endif /* BINSEARCH_H */
 /** @internal
  * @} */
diff --git a/pkg/lua/include/lua_builtin.h b/pkg/lua/include/lua_builtin.h
index fcfec30bdf58..fe847fd4adf7 100644
--- a/pkg/lua/include/lua_builtin.h
+++ b/pkg/lua/include/lua_builtin.h
@@ -5,6 +5,9 @@
  * General Public License v2.1. See the file LICENSE in the top level
  * directory for more details.
  */
+
+#pragma once
+
 /**
  * @ingroup  pkg_lua
  * @{
@@ -22,9 +25,6 @@
  * they will default to zero (or NULL), that is, empty tables.
  */
 
-#ifndef LUA_BUILTIN_H
-#define LUA_BUILTIN_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -79,6 +79,5 @@ extern WEAK const size_t lua_riot_builtin_c_table_len;
 extern "C" }
 #endif
 
-#endif /* LUA_BUILTIN_H */
 
 /** @} */
diff --git a/pkg/lua/include/lua_loadlib.h b/pkg/lua/include/lua_loadlib.h
index de66e75962ab..9f8bdf64c950 100644
--- a/pkg/lua/include/lua_loadlib.h
+++ b/pkg/lua/include/lua_loadlib.h
@@ -5,6 +5,9 @@
  * General Public License v2.1. See the file LICENSE in the top level
  * directory for more details.
  */
+
+#pragma once
+
 /**
  * @ingroup  pkg_lua
  * @{
@@ -15,9 +18,6 @@
  *
  */
 
-#ifndef LUA_LOADLIB_H
-#define LUA_LOADLIB_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -53,6 +53,5 @@ extern "C"
 }
 #endif
 
-#endif /* LUA_LOADLIB_H */
 
 /** @} */
diff --git a/pkg/lua/include/lua_run.h b/pkg/lua/include/lua_run.h
index f898d6e9e88b..e3f86028da90 100644
--- a/pkg/lua/include/lua_run.h
+++ b/pkg/lua/include/lua_run.h
@@ -5,6 +5,9 @@
  * General Public License v2.1. See the file LICENSE in the top level
  * directory for more details.
  */
+
+#pragma once
+
 /**
  * @ingroup  pkg_lua
  * @file
@@ -27,9 +30,6 @@
  *
  */
 
-#ifndef LUA_RUN_H
-#define LUA_RUN_H
-
 #include <stdint.h>
 
 #include "lua.h"
@@ -219,5 +219,3 @@ extern "C" }
 #endif
 
 /** @} */
-
-#endif /* LUA_RUN_H */
diff --git a/pkg/lv_drivers/include/lv_drv_conf.h b/pkg/lv_drivers/include/lv_drv_conf.h
index 2d2d24501d25..5b67d99fb1a3 100644
--- a/pkg/lv_drivers/include/lv_drv_conf.h
+++ b/pkg/lv_drivers/include/lv_drv_conf.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_lv_drivers
  * @brief       LVGL Drivers SDL2 configuration headers
@@ -16,9 +18,6 @@
  * @author      Francisco Molina <francois-xavier.molina@inria.fr>
  */
 
-#ifndef LV_DRV_CONF_H
-#define LV_DRV_CONF_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -80,5 +79,4 @@ extern "C" {
 }
 #endif
 
-#endif /* LV_DRV_CONF_H */
 /** @} */
diff --git a/pkg/lvgl/include/lv_conf.h b/pkg/lvgl/include/lv_conf.h
index 0eaf494033a2..d791531bff89 100644
--- a/pkg/lvgl/include/lv_conf.h
+++ b/pkg/lvgl/include/lv_conf.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_lvgl
  * @brief       LVGL configuration macros
@@ -14,9 +16,6 @@
  * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
  */
 
-#ifndef LV_CONF_H
-#define LV_CONF_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -552,5 +551,4 @@ e.g. "stm32f769xx.h" or "stm32f429xx.h"*/
 }
 #endif
 
-#endif /* LV_CONF_H */
 /** @} */
diff --git a/pkg/lvgl/include/lvgl_riot.h b/pkg/lvgl/include/lvgl_riot.h
index 93e69f873668..acbe74bdd9cf 100644
--- a/pkg/lvgl/include/lvgl_riot.h
+++ b/pkg/lvgl/include/lvgl_riot.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_lvgl
  * @{
@@ -16,9 +18,6 @@
  * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
  */
 
-#ifndef LVGL_RIOT_H
-#define LVGL_RIOT_H
-
 #include "screen_dev.h"
 
 #ifdef __cplusplus
@@ -56,5 +55,4 @@ void lvgl_wakeup(void);
 }
 #endif
 
-#endif /* LVGL_RIOT_H */
 /** @} */
diff --git a/pkg/lvgl/include/lvgl_riot_conf.h b/pkg/lvgl/include/lvgl_riot_conf.h
index 1a7a56c40757..170df39171cd 100644
--- a/pkg/lvgl/include/lvgl_riot_conf.h
+++ b/pkg/lvgl/include/lvgl_riot_conf.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_lvgl
  * @{
@@ -16,9 +18,6 @@
  * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
  */
 
-#ifndef LVGL_RIOT_CONF_H
-#define LVGL_RIOT_CONF_H
-
 #include "kernel_defines.h"
 #include "board.h"
 #if IS_USED(MODULE_LV_DRIVERS_SDL)
@@ -62,5 +61,4 @@ typedef int16_t lv_coord_t;
 }
 #endif
 
-#endif /* LVGL_RIOT_CONF_H */
 /** @} */
diff --git a/pkg/lwip/include/arch/cc.h b/pkg/lwip/include/arch/cc.h
index 950c0b85072a..b8710912242d 100644
--- a/pkg/lwip/include/arch/cc.h
+++ b/pkg/lwip/include/arch/cc.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @addtogroup  pkg_lwip_sys
  * @brief       Describes compiler and processor to lwIP
@@ -17,8 +19,6 @@
  *
  * @author  Martine Lenders <mlenders@inf.fu-berlin.de>
  */
-#ifndef ARCH_CC_H
-#define ARCH_CC_H
 
 #include <inttypes.h>
 #include <stdio.h>
@@ -107,5 +107,4 @@ extern "C" {
 }
 #endif
 
-#endif /* ARCH_CC_H */
 /** @} */
diff --git a/pkg/lwip/include/arch/sys_arch.h b/pkg/lwip/include/arch/sys_arch.h
index e7b220de38cc..81cc5ac76be6 100644
--- a/pkg/lwip/include/arch/sys_arch.h
+++ b/pkg/lwip/include/arch/sys_arch.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_lwip_sys    Porting layer
  * @ingroup     pkg_lwip
@@ -18,8 +20,6 @@
  *
  * @author  Martine Lenders <mlenders@inf.fu-berlin.de>
  */
-#ifndef ARCH_SYS_ARCH_H
-#define ARCH_SYS_ARCH_H
 
 #include <stdbool.h>
 #include <stdint.h>
@@ -140,5 +140,4 @@ void sys_unlock_tcpip_core(void);
 }
 #endif
 
-#endif /* ARCH_SYS_ARCH_H */
 /** @} */
diff --git a/pkg/lwip/include/lwip.h b/pkg/lwip/include/lwip.h
index 8814b4a1c458..1fdeec37a5ff 100644
--- a/pkg/lwip/include/lwip.h
+++ b/pkg/lwip/include/lwip.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_lwip
  *
@@ -16,8 +18,6 @@
  *
  * @author  Martine Lenders <mlenders@inf.fu-berlin.de>
  */
-#ifndef LWIP_H
-#define LWIP_H
 
 #include "event.h"
 
@@ -42,5 +42,4 @@ void lwip_bootstrap(void);
 }
 #endif
 
-#endif /* LWIP_H */
 /** @} */
diff --git a/pkg/lwip/include/lwip/netif/compat.h b/pkg/lwip/include/lwip/netif/compat.h
index 8628295683ac..e152534b8bd4 100644
--- a/pkg/lwip/include/lwip/netif/compat.h
+++ b/pkg/lwip/include/lwip/netif/compat.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_lwip
  *
@@ -17,8 +19,6 @@
  *
  * @author  Erik Ekman <eekman@google.com>
  */
-#ifndef LWIP_NETIF_COMPAT_H
-#define LWIP_NETIF_COMPAT_H
 
 #include "bhp/event.h"
 #include "event.h"
@@ -82,5 +82,4 @@ static inline void lwip_netif_dev_release(struct netif *netif)
 }
 #endif
 
-#endif /* LWIP_NETIF_COMPAT_H */
 /** @} */
diff --git a/pkg/lwip/include/lwip/netif/netdev.h b/pkg/lwip/include/lwip/netif/netdev.h
index 2163021a9f6a..c2ff29482e8d 100644
--- a/pkg/lwip/include/lwip/netif/netdev.h
+++ b/pkg/lwip/include/lwip/netif/netdev.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_lwip_netdev    lwIP netdev adapter
  * @ingroup     pkg_lwip
@@ -17,8 +19,6 @@
  *
  * @author  Martine Lenders <mlenders@inf.fu-berlin.de>
  */
-#ifndef LWIP_NETIF_NETDEV_H
-#define LWIP_NETIF_NETDEV_H
 
 #include "net/ethernet.h"
 #include "net/netdev.h"
@@ -59,5 +59,4 @@ err_t lwip_netdev_init(struct netif *netif);
 }
 #endif
 
-#endif /* LWIP_NETIF_NETDEV_H */
 /** @} */
diff --git a/pkg/lwip/include/lwip/sock_internal.h b/pkg/lwip/include/lwip/sock_internal.h
index ee1af480d16d..d0ed16ad2fa0 100644
--- a/pkg/lwip/include/lwip/sock_internal.h
+++ b/pkg/lwip/include/lwip/sock_internal.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_lwip_sock   lwIP-specific implementation of sock API
  * @ingroup     pkg_lwip
@@ -19,8 +21,6 @@
  *
  * @author  Martine Lenders <mlenders@inf.fu-berlin.de>
  */
-#ifndef LWIP_SOCK_INTERNAL_H
-#define LWIP_SOCK_INTERNAL_H
 
 #include <stdbool.h>
 #include <stdint.h>
@@ -77,6 +77,5 @@ static inline ssize_t lwip_sock_send(struct netconn *conn,
 }
 #endif
 
-#endif /* LWIP_SOCK_INTERNAL_H */
 /** @internal
  * @} */
diff --git a/pkg/lwip/include/lwip_init_devs.h b/pkg/lwip/include/lwip_init_devs.h
index d0344f4fb46e..e03d9b30a411 100644
--- a/pkg/lwip/include/lwip_init_devs.h
+++ b/pkg/lwip/include/lwip_init_devs.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup sys_auto_init_lwip_netif
  *
@@ -17,9 +19,6 @@
  * @author  Erik Ekman <eekman@google.com>
  */
 
-#ifndef LWIP_INIT_DEVS_H
-#define LWIP_INIT_DEVS_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -73,5 +72,4 @@ typedef void (*lwip_netif_setup_func_t)(void);
 }
 #endif
 
-#endif /* LWIP_INIT_DEVS_H */
 /** @} */
diff --git a/pkg/lwip/include/lwipopts.h b/pkg/lwip/include/lwipopts.h
index 1b179fb23b63..3039cd710770 100644
--- a/pkg/lwip/include/lwipopts.h
+++ b/pkg/lwip/include/lwipopts.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_lwip_opts   lwIP options
  * @ingroup     pkg_lwip
@@ -17,8 +19,6 @@
  *
  * @author  Martine Lenders <mlenders@inf.fu-berlin.de>
  */
-#ifndef LWIPOPTS_H
-#define LWIPOPTS_H
 
 #include "thread.h"
 #include "net/gnrc/netif/hdr.h"
@@ -186,5 +186,4 @@ bool sys_check_core_locked(void);
 }
 #endif
 
-#endif /* LWIPOPTS_H */
 /** @} */
diff --git a/pkg/lwip/include/sock_types.h b/pkg/lwip/include/sock_types.h
index 33e4686cba53..02017d283a52 100644
--- a/pkg/lwip/include/sock_types.h
+++ b/pkg/lwip/include/sock_types.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @addtogroup pkg_lwip_sock
  * @{
@@ -15,8 +17,6 @@
  *
  * @author  Martine Lenders <mlenders@inf.fu-berlin.de>
  */
-#ifndef SOCK_TYPES_H
-#define SOCK_TYPES_H
 
 #include "net/af.h"
 #include "lwip/api.h"
@@ -133,5 +133,4 @@ struct sock_udp {
 }
 #endif
 
-#endif /* SOCK_TYPES_H */
 /** @} */
diff --git a/pkg/mbedtls/include/entropy_mbedtls_riot.h b/pkg/mbedtls/include/entropy_mbedtls_riot.h
index 29dcb0f0da6d..ab30cc2ae09b 100644
--- a/pkg/mbedtls/include/entropy_mbedtls_riot.h
+++ b/pkg/mbedtls/include/entropy_mbedtls_riot.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_mbedtls_entropy Access API to Mbed TLS entropy module
  * @ingroup     pkg_mbedtls
@@ -19,9 +21,6 @@
  *
  */
 
-#ifndef ENTROPY_MBEDTLS_RIOT_H
-#define ENTROPY_MBEDTLS_RIOT_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -77,5 +76,3 @@ int entropy_mbedtls_riot_get(unsigned char *output, size_t len);
 }
 #endif
 /** @} */
-
-#endif /* ENTROPY_MBEDTLS_RIOT_H */
diff --git a/pkg/mbedtls/include/entropy_sources_mbedtls_riot.h b/pkg/mbedtls/include/entropy_sources_mbedtls_riot.h
index fa7791ef7b85..c8befac47656 100644
--- a/pkg/mbedtls/include/entropy_sources_mbedtls_riot.h
+++ b/pkg/mbedtls/include/entropy_sources_mbedtls_riot.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_mbedtls_entropy_sources Entropy source API to Mbed TLS
  * @ingroup     pkg_mbedtls
@@ -18,9 +20,6 @@
  *
  */
 
-#ifndef ENTROPY_SOURCES_MBEDTLS_RIOT_H
-#define ENTROPY_SOURCES_MBEDTLS_RIOT_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -89,5 +88,3 @@ int riot_adc_poll(void *data, unsigned char *output, size_t len,
 }
 #endif
 /** @} */
-
-#endif /* ENTROPY_SOURCES_MBEDTLS_RIOT_H */
diff --git a/pkg/mbedtls/include/riot_mbedtls_config.h b/pkg/mbedtls/include/riot_mbedtls_config.h
index 68879b3e9cc2..92c55ef1516e 100644
--- a/pkg/mbedtls/include/riot_mbedtls_config.h
+++ b/pkg/mbedtls/include/riot_mbedtls_config.h
@@ -28,8 +28,7 @@
  *  limitations under the License.
  */
 
-#ifndef RIOT_MBEDTLS_CONFIG_H
-#define RIOT_MBEDTLS_CONFIG_H
+#pragma once
 
 #if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_DEPRECATE)
 #define _CRT_SECURE_NO_DEPRECATE 1
@@ -235,5 +234,4 @@ extern "C" {
 }
 #endif
 
-#endif /* RIOT_MBEDTLS_CONFIG_H */
 /** @} */
diff --git a/pkg/mbedtls/include/sha256_alt.h b/pkg/mbedtls/include/sha256_alt.h
index cbb015dea2fc..2993ccd17002 100644
--- a/pkg/mbedtls/include/sha256_alt.h
+++ b/pkg/mbedtls/include/sha256_alt.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_mbedtls
  *
@@ -16,9 +18,6 @@
  *
  */
 
-#ifndef SHA256_ALT_H
-#define SHA256_ALT_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -44,4 +43,3 @@ typedef struct {
 }
 #endif
 /** @} */
-#endif /* SHA256_ALT_H */
diff --git a/pkg/mbedtls/include/threading_alt.h b/pkg/mbedtls/include/threading_alt.h
index 3d442127a3be..07f82e969588 100644
--- a/pkg/mbedtls/include/threading_alt.h
+++ b/pkg/mbedtls/include/threading_alt.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_mbedtls
  *
@@ -16,9 +18,6 @@
  *
  */
 
-#ifndef THREADING_ALT_H
-#define THREADING_ALT_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -41,4 +40,3 @@ typedef struct {
 }
 #endif
 /** @} */
-#endif /* THREADING_ALT_H */
diff --git a/pkg/micropython/include/micropython.h b/pkg/micropython/include/micropython.h
index 9c4839166cf4..8556289d1125 100644
--- a/pkg/micropython/include/micropython.h
+++ b/pkg/micropython/include/micropython.h
@@ -8,6 +8,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_micropython
  *
@@ -19,9 +21,6 @@
  * @author      Kaspar Schleiser <kaspar@schleiser.de>
  */
 
-#ifndef MICROPYTHON_H
-#define MICROPYTHON_H
-
 #include <stdint.h>
 
 #ifdef __cplusplus
@@ -55,5 +54,4 @@ void mp_riot_init(char* heap, size_t heap_size);
  */
 void mp_do_str(const char *src, int len);
 
-#endif /* MICROPYTHON_H */
 /** @} */
diff --git a/pkg/mynewt-core/include/hal/hal_gpio.h b/pkg/mynewt-core/include/hal/hal_gpio.h
index b09ba8beeaa0..cd4c256520d0 100644
--- a/pkg/mynewt-core/include/hal/hal_gpio.h
+++ b/pkg/mynewt-core/include/hal/hal_gpio.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_dw1000
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef HAL_HAL_GPIO_H
-#define HAL_HAL_GPIO_H
-
 #include "periph/gpio.h"
 
 #ifdef __cplusplus
@@ -193,5 +192,3 @@ static inline void hal_gpio_irq_disable(gpio_t pin)
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* HAL_HAL_GPIO_H */
diff --git a/pkg/mynewt-core/include/hal/hal_spi.h b/pkg/mynewt-core/include/hal/hal_spi.h
index da13747bb1a9..b9a79a499e20 100644
--- a/pkg/mynewt-core/include/hal/hal_spi.h
+++ b/pkg/mynewt-core/include/hal/hal_spi.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_dw1000
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef HAL_HAL_SPI_H
-#define HAL_HAL_SPI_H
-
 #include "periph/spi.h"
 
 #ifdef __cplusplus
@@ -165,5 +164,3 @@ int hal_spi_txrx_noblock(int spi_num, void *txbuf, void *rxbuf, int cnt);
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* HAL_HAL_SPI_H */
diff --git a/pkg/mynewt-core/include/log/log.h b/pkg/mynewt-core/include/log/log.h
index 7ee5fe776e96..41479be36bc8 100644
--- a/pkg/mynewt-core/include/log/log.h
+++ b/pkg/mynewt-core/include/log/log.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_mynewt_core
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef LOG_LOG_H
-#define LOG_LOG_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -44,5 +43,3 @@ struct log {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* LOG_LOG_H */
diff --git a/pkg/mynewt-core/include/mcu/mcu.h b/pkg/mynewt-core/include/mcu/mcu.h
index 2c3185a5c17d..4a2e255b27f6 100644
--- a/pkg/mynewt-core/include/mcu/mcu.h
+++ b/pkg/mynewt-core/include/mcu/mcu.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_mynewt_core
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef MCU_MCU_H
-#define MCU_MCU_H
-
 #include "cpu.h"
 
 #ifdef __cplusplus
@@ -57,5 +56,3 @@ void nrf5x_hw_set_isr(int irqn, void (*addr)(void));
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* MCU_MCU_H */
diff --git a/pkg/mynewt-core/include/os/mynewt.h b/pkg/mynewt-core/include/os/mynewt.h
index 97bf9c986dd7..66f2173efede 100644
--- a/pkg/mynewt-core/include/os/mynewt.h
+++ b/pkg/mynewt-core/include/os/mynewt.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_mynewt_core
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef OS_MYNEWT_H
-#define OS_MYNEWT_H
-
 #include <stdlib.h>
 #include "syscfg/syscfg.h"
 #include "sysinit/sysinit.h"
@@ -32,5 +31,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* OS_MYNEWT_H */
diff --git a/pkg/mynewt-core/include/os/os.h b/pkg/mynewt-core/include/os/os.h
index 0de55584df3f..c05cc9164d19 100644
--- a/pkg/mynewt-core/include/os/os.h
+++ b/pkg/mynewt-core/include/os/os.h
@@ -26,6 +26,8 @@
  * under the License.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_mynewt_core
  * @{
@@ -36,9 +38,6 @@
  * @}
  */
 
-#ifndef OS_OS_H
-#define OS_OS_H
-
 #include <assert.h>
 #include <stdint.h>
 
@@ -142,5 +141,3 @@ static inline bool os_hw_is_in_critical(void)
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* OS_OS_H */
diff --git a/pkg/mynewt-core/include/os/os_dev.h b/pkg/mynewt-core/include/os/os_dev.h
index 6998d0887cc5..24bfe6d09b0c 100644
--- a/pkg/mynewt-core/include/os/os_dev.h
+++ b/pkg/mynewt-core/include/os/os_dev.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_mynewt_core
  * @{
@@ -16,8 +18,6 @@
  * @author      Francisco Molina <francois-xavier.molina@inria.fr>
  * @}
  */
-#ifndef OS_OS_DEV_H
-#define OS_OS_DEV_H
 
 #ifdef __cplusplus
 extern "C" {
@@ -40,5 +40,3 @@ struct os_dev {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* OS_OS_DEV_H */
diff --git a/pkg/mynewt-core/include/os/os_eventq.h b/pkg/mynewt-core/include/os/os_eventq.h
index 6a49d058f4de..9c0e63334ce6 100644
--- a/pkg/mynewt-core/include/os/os_eventq.h
+++ b/pkg/mynewt-core/include/os/os_eventq.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_mynewt_core
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef OS_OS_EVENTQ_H
-#define OS_OS_EVENTQ_H
-
 #include <os/os_types.h>
 
 #include "event/callback.h"
@@ -232,5 +231,3 @@ static inline bool os_eventq_is_empty(struct os_eventq *evq)
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* OS_OS_EVENTQ_H */
diff --git a/pkg/mynewt-core/include/os/os_time.h b/pkg/mynewt-core/include/os/os_time.h
index 1ca7f50a598a..1ffb22c14542 100644
--- a/pkg/mynewt-core/include/os/os_time.h
+++ b/pkg/mynewt-core/include/os/os_time.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_mynewt_core
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef OS_OS_TIME_H
-#define OS_OS_TIME_H
-
 #include "os/os_error.h"
 #include "ztimer.h"
 
@@ -112,5 +111,3 @@ static inline void os_time_delay(os_time_t ticks)
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* OS_OS_TIME_H */
diff --git a/pkg/mynewt-core/include/os/os_types.h b/pkg/mynewt-core/include/os/os_types.h
index 819f093e838f..a9c871724e81 100644
--- a/pkg/mynewt-core/include/os/os_types.h
+++ b/pkg/mynewt-core/include/os/os_types.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_mynewt_core
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef OS_OS_TYPES_H
-#define OS_OS_TYPES_H
-
 #include <stdint.h>
 
 #ifdef __cplusplus
@@ -55,5 +54,3 @@ typedef char os_stack_t;
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* OS_OS_TYPES_H */
diff --git a/pkg/mynewt-core/include/syscfg/syscfg.h b/pkg/mynewt-core/include/syscfg/syscfg.h
index c73c60f65017..be9046f2a605 100644
--- a/pkg/mynewt-core/include/syscfg/syscfg.h
+++ b/pkg/mynewt-core/include/syscfg/syscfg.h
@@ -26,6 +26,8 @@
  * under the License.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_mynewt_core
  * @{
@@ -36,9 +38,6 @@
  * @}
  */
 
-#ifndef SYSCFG_SYSCFG_H
-#define SYSCFG_SYSCFG_H
-
 #include "kernel_defines.h"
 
 /**
@@ -127,5 +126,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* SYSCFG_SYSCFG_H */
diff --git a/pkg/mynewt-core/include/sysinit/sysinit.h b/pkg/mynewt-core/include/sysinit/sysinit.h
index 7c65fd56f6ef..6daf0b0a2c4a 100644
--- a/pkg/mynewt-core/include/sysinit/sysinit.h
+++ b/pkg/mynewt-core/include/sysinit/sysinit.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_mynewt_core
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef SYSINIT_SYSINIT_H
-#define SYSINIT_SYSINIT_H
-
 #include "assert.h"
 
 #ifdef __cplusplus
@@ -39,5 +38,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* SYSINIT_SYSINIT_H */
diff --git a/pkg/nanocbor/include/nanocbor/config.h b/pkg/nanocbor/include/nanocbor/config.h
index 5931775be35d..e902c93d9192 100644
--- a/pkg/nanocbor/include/nanocbor/config.h
+++ b/pkg/nanocbor/include/nanocbor/config.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    nanocbor_config NanoCBOR configuration header
  * @ingroup     pkg_nanocbor
@@ -13,9 +15,6 @@
  * @brief       Provides compile-time configuration for nanocbor
  */
 
-#ifndef NANOCBOR_CONFIG_H
-#define NANOCBOR_CONFIG_H
-
 #include <stdint.h>
 
 #ifdef __cplusplus
@@ -79,5 +78,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* NANOCBOR_CONFIG_H */
diff --git a/pkg/nimble/addr/include/nimble_addr.h b/pkg/nimble/addr/include/nimble_addr.h
index e29cbab9d28a..7b9dc532c5fa 100644
--- a/pkg/nimble/addr/include/nimble_addr.h
+++ b/pkg/nimble/addr/include/nimble_addr.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_nimble_addr Address Helper
  * @ingroup     pkg_nimble
@@ -18,9 +20,6 @@
  * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
  */
 
-#ifndef NIMBLE_ADDR_H
-#define NIMBLE_ADDR_H
-
 #include "nimble/ble.h"
 
 #ifdef __cplusplus
@@ -54,5 +53,4 @@ void nimble_addr_sprint(char *buf, const ble_addr_t *addr);
 }
 #endif
 
-#endif /* NIMBLE_ADDR_H */
 /** @} */
diff --git a/pkg/nimble/autoadv/include/nimble_autoadv.h b/pkg/nimble/autoadv/include/nimble_autoadv.h
index dd4d27928191..e9b40937aedc 100644
--- a/pkg/nimble/autoadv/include/nimble_autoadv.h
+++ b/pkg/nimble/autoadv/include/nimble_autoadv.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_nimble_autoadv Automated advertising
  * @ingroup     pkg_nimble
@@ -25,9 +27,6 @@
  * @author      Hendrik van Essen <hendrik.ve@fu-berlin.de>
  */
 
-#ifndef NIMBLE_AUTOADV_H
-#define NIMBLE_AUTOADV_H
-
 #include "host/ble_gap.h"
 
 #ifdef __cplusplus
@@ -191,4 +190,3 @@ int nimble_autoadv_get_adv_instance(void);
 }
 #endif
 /** @} */
-#endif /* NIMBLE_AUTOADV_H */
diff --git a/pkg/nimble/autoadv/include/nimble_autoadv_params.h b/pkg/nimble/autoadv/include/nimble_autoadv_params.h
index de99ca6e7108..9b7308a1c559 100644
--- a/pkg/nimble/autoadv/include/nimble_autoadv_params.h
+++ b/pkg/nimble/autoadv/include/nimble_autoadv_params.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_nimble_autoadv
  *
@@ -16,9 +18,6 @@
  * @author      Francisco Molina <francois-xavier.molina@inria.fr>
  */
 
-#ifndef NIMBLE_AUTOADV_PARAMS_H
-#define NIMBLE_AUTOADV_PARAMS_H
-
 #include "nimble_autoadv.h"
 #include "nimble_riot.h"
 
@@ -80,5 +79,4 @@ static const nimble_autoadv_cfg_t nimble_autoadv_cfg =
 }
 #endif
 
-#endif /* NIMBLE_AUTOADV_PARAMS_H */
 /** @} */
diff --git a/pkg/nimble/autoconn/include/nimble_autoconn.h b/pkg/nimble/autoconn/include/nimble_autoconn.h
index d600b650e2d1..2b3638bafb86 100644
--- a/pkg/nimble/autoconn/include/nimble_autoconn.h
+++ b/pkg/nimble/autoconn/include/nimble_autoconn.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_nimble_autoconn Autoconn
  * @ingroup     pkg_nimble
@@ -106,9 +108,6 @@
  * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
  */
 
-#ifndef NIMBLE_AUTOCONN_H
-#define NIMBLE_AUTOCONN_H
-
 #include <stdint.h>
 
 #include "nimble_netif.h"
@@ -217,5 +216,4 @@ void nimble_autoconn_disable(void);
 }
 #endif
 
-#endif /* NIMBLE_AUTOCONN_H */
 /** @} */
diff --git a/pkg/nimble/autoconn/include/nimble_autoconn_params.h b/pkg/nimble/autoconn/include/nimble_autoconn_params.h
index 121bb034911b..bcf9503cb0b7 100644
--- a/pkg/nimble/autoconn/include/nimble_autoconn_params.h
+++ b/pkg/nimble/autoconn/include/nimble_autoconn_params.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_nimble_autoconn
  *
@@ -16,9 +18,6 @@
  * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
  */
 
-#ifndef NIMBLE_AUTOCONN_PARAMS_H
-#define NIMBLE_AUTOCONN_PARAMS_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -103,5 +102,4 @@ static const nimble_autoconn_params_t nimble_autoconn_params =
 }
 #endif
 
-#endif /* NIMBLE_AUTOCONN_PARAMS_H */
 /** @} */
diff --git a/pkg/nimble/contrib/include/nimble_riot.h b/pkg/nimble/contrib/include/nimble_riot.h
index 0dc39d3c514b..62960a9fa525 100644
--- a/pkg/nimble/contrib/include/nimble_riot.h
+++ b/pkg/nimble/contrib/include/nimble_riot.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_nimble_contrib RIOT Integration
  * @ingroup     pkg_nimble
@@ -19,9 +21,6 @@
  * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
  */
 
-#ifndef NIMBLE_RIOT_H
-#define NIMBLE_RIOT_H
-
 #include <stdbool.h>
 #include <stdint.h>
 #include "kernel_defines.h"
@@ -120,5 +119,4 @@ int nimble_riot_get_phy_hci(uint8_t mode);
 }
 #endif
 
-#endif /* NIMBLE_RIOT_H */
 /** @} */
diff --git a/pkg/nimble/netif/include/nimble_netif.h b/pkg/nimble/netif/include/nimble_netif.h
index e955d1a7c540..f04fa87ded80 100644
--- a/pkg/nimble/netif/include/nimble_netif.h
+++ b/pkg/nimble/netif/include/nimble_netif.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_nimble_netif GNRC netif Implementation
  * @ingroup     pkg_nimble
@@ -63,9 +65,6 @@
  * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
  */
 
-#ifndef NIMBLE_NETIF_H
-#define NIMBLE_NETIF_H
-
 #include <stdint.h>
 #include <errno.h>
 
@@ -336,5 +335,4 @@ int nimble_netif_used_chanmap(int handle, uint8_t map[5]);
 }
 #endif
 
-#endif /* NIMBLE_NETIF_H */
 /** @} */
diff --git a/pkg/nimble/netif/include/nimble_netif_conn.h b/pkg/nimble/netif/include/nimble_netif_conn.h
index 01bf675799bb..59c2aea864a2 100644
--- a/pkg/nimble/netif/include/nimble_netif_conn.h
+++ b/pkg/nimble/netif/include/nimble_netif_conn.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_nimble_netif_conn Connection State Management for netif
  * @ingroup     pkg_nimble_netif
@@ -19,9 +21,6 @@
  * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
  */
 
-#ifndef NIMBLE_NETIF_CONN_H
-#define NIMBLE_NETIF_CONN_H
-
 #include <stdint.h>
 #include <stdbool.h>
 
@@ -287,5 +286,4 @@ static inline int nimble_netif_conn_is_adv(void)
 }
 #endif
 
-#endif /* NIMBLE_NETIF_CONN_H */
 /** @} */
diff --git a/pkg/nimble/npl/include/nimble/nimble_npl_os.h b/pkg/nimble/npl/include/nimble/nimble_npl_os.h
index 9ee612444894..0c31fa572051 100644
--- a/pkg/nimble/npl/include/nimble/nimble_npl_os.h
+++ b/pkg/nimble/npl/include/nimble/nimble_npl_os.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_nimble
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef NIMBLE_NIMBLE_NPL_OS_H
-#define NIMBLE_NIMBLE_NPL_OS_H
-
 #include <stdint.h>
 #include <stdbool.h>
 #include "os/os.h"
@@ -587,5 +586,3 @@ nrf52_clock_hfxo_release(void)
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* NIMBLE_NIMBLE_NPL_OS_H */
diff --git a/pkg/nimble/rpble/include/nimble_rpble.h b/pkg/nimble/rpble/include/nimble_rpble.h
index d09c292ad503..1cfd78a8d83a 100644
--- a/pkg/nimble/rpble/include/nimble_rpble.h
+++ b/pkg/nimble/rpble/include/nimble_rpble.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_nimble_rpble RPL-over-BLE for NimBLE
  * @ingroup     pkg_nimble
@@ -82,9 +84,6 @@
  * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
  */
 
-#ifndef NIMBLE_RPBLE_H
-#define NIMBLE_RPBLE_H
-
 #include "nimble_netif.h"
 
 #ifdef __cplusplus
@@ -178,5 +177,4 @@ int nimble_rpble_update(const nimble_rpble_ctx_t *ctx);
 }
 #endif
 
-#endif /* NIMBLE_RPBLE_H */
 /** @} */
diff --git a/pkg/nimble/rpble/include/nimble_rpble_params.h b/pkg/nimble/rpble/include/nimble_rpble_params.h
index 6e0351293903..3449c6f47bd7 100644
--- a/pkg/nimble/rpble/include/nimble_rpble_params.h
+++ b/pkg/nimble/rpble/include/nimble_rpble_params.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_nimble_rpble
  *
@@ -16,9 +18,6 @@
  * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
  */
 
-#ifndef NIMBLE_RPBLE_PARAMS_H
-#define NIMBLE_RPBLE_PARAMS_H
-
 #include "nimble_rpble.h"
 
 #ifdef __cplusplus
@@ -103,5 +102,4 @@ static const nimble_rpble_cfg_t nimble_rpble_params = NIMBLE_RPBLE_PARAMS;
 }
 #endif
 
-#endif /* NIMBLE_RPBLE_PARAMS_H */
 /** @} */
diff --git a/pkg/nimble/scanlist/include/nimble_scanlist.h b/pkg/nimble/scanlist/include/nimble_scanlist.h
index bc80cd072d7f..e0c2025c9366 100644
--- a/pkg/nimble/scanlist/include/nimble_scanlist.h
+++ b/pkg/nimble/scanlist/include/nimble_scanlist.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_nimble_scanlist Scan Result Helper
  * @ingroup     pkg_nimble
@@ -22,9 +24,6 @@
  * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
  */
 
-#ifndef NIMBLE_SCANLIST_H
-#define NIMBLE_SCANLIST_H
-
 #include "clist.h"
 #include "net/ble.h"
 #include "nimble/ble.h"
@@ -120,5 +119,4 @@ void nimble_scanlist_print_entry(nimble_scanlist_entry_t *e);
 }
 #endif
 
-#endif /* NIMBLE_SCANLIST_H */
 /** @} */
diff --git a/pkg/nimble/scanner/include/nimble_scanner.h b/pkg/nimble/scanner/include/nimble_scanner.h
index a58d2e6754fc..ae073ac68eb9 100644
--- a/pkg/nimble/scanner/include/nimble_scanner.h
+++ b/pkg/nimble/scanner/include/nimble_scanner.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_nimble_scanner Scanner Helper
  * @ingroup     pkg_nimble
@@ -18,9 +20,6 @@
  * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
  */
 
-#ifndef NIMBLE_SCANNER_H
-#define NIMBLE_SCANNER_H
-
 #include <errno.h>
 #include <stdint.h>
 #include <stdbool.h>
@@ -170,5 +169,4 @@ void nimble_scanner_set_scan_duration(int32_t duration_ms);
 }
 #endif
 
-#endif /* NIMBLE_SCANNER_H */
 /** @} */
diff --git a/pkg/nimble/statconn/include/nimble_statconn.h b/pkg/nimble/statconn/include/nimble_statconn.h
index 63ef2c32810e..c94aa87fa1bd 100644
--- a/pkg/nimble/statconn/include/nimble_statconn.h
+++ b/pkg/nimble/statconn/include/nimble_statconn.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_nimble_statconn Statconn
  * @ingroup     pkg_nimble
@@ -47,9 +49,6 @@
  * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
  */
 
-#ifndef NIMBLE_STATCONN_H
-#define NIMBLE_STATCONN_H
-
 #include <errno.h>
 #include <stdint.h>
 
@@ -193,5 +192,4 @@ int nimble_statconn_rm(const uint8_t *addr);
 }
 #endif
 
-#endif /* NIMBLE_STATCONN_H */
 /** @} */
diff --git a/pkg/nrfx/include/nrfx_config.h b/pkg/nrfx/include/nrfx_config.h
index e78a506cc821..7786fed88ef7 100644
--- a/pkg/nrfx/include/nrfx_config.h
+++ b/pkg/nrfx/include/nrfx_config.h
@@ -31,6 +31,8 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_nrfx
  * @{
@@ -41,9 +43,6 @@
  * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
  */
 
-#ifndef NRFX_CONFIG_H
-#define NRFX_CONFIG_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -55,5 +54,4 @@ extern "C" {
 }
 #endif
 
-#endif /* NRFX_CONFIG_H */
 /** @} **/
diff --git a/pkg/nrfx/include/nrfx_glue.h b/pkg/nrfx/include/nrfx_glue.h
index 824f95c7968c..e77c314aa926 100644
--- a/pkg/nrfx/include/nrfx_glue.h
+++ b/pkg/nrfx/include/nrfx_glue.h
@@ -31,6 +31,8 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_nrfx
  * @{
@@ -43,9 +45,6 @@
  * @author      Nordic Semiconductor ASA
  */
 
-#ifndef NRFX_GLUE_H
-#define NRFX_GLUE_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -281,5 +280,4 @@ extern "C" {
 }
 #endif
 
-#endif /* NRFX_GLUE_H */
 /** @} */
diff --git a/pkg/opendsme/include/opendsme/DSMEMessage.h b/pkg/opendsme/include/opendsme/DSMEMessage.h
index 0b202a025496..3cd2dd772a64 100644
--- a/pkg/opendsme/include/opendsme/DSMEMessage.h
+++ b/pkg/opendsme/include/opendsme/DSMEMessage.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_opendsme_dsmemessage DSME Message interface implementation.
  * @ingroup     pkg_opendsme
@@ -19,9 +21,6 @@
  * @author  José I. Álamos <jose.alamos@haw-hamburg.de>
  */
 
-#ifndef OPENDSME_DSMEMESSAGE_H
-#define OPENDSME_DSMEMESSAGE_H
-
 #include <stdint.h>
 #include <string.h>
 
@@ -336,5 +335,4 @@ friend class DSMEMessageBuffer;
 }
 #endif
 
-#endif /* OPENDSME_DSMEMESSAGE_H */
 /** @} */
diff --git a/pkg/opendsme/include/opendsme/DSMEPlatform.h b/pkg/opendsme/include/opendsme/DSMEPlatform.h
index fad23b2aca39..2c5c9bce7d21 100644
--- a/pkg/opendsme/include/opendsme/DSMEPlatform.h
+++ b/pkg/opendsme/include/opendsme/DSMEPlatform.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_opendsme_dsmeplatform DSME Platform interface implementation.
  * @ingroup     pkg_opendsme
@@ -19,9 +21,6 @@
  * @author  José I. Álamos <jose.alamos@haw-hamburg.de>
  */
 
-#ifndef OPENDSME_DSMEPLATFORM_H
-#define OPENDSME_DSMEPLATFORM_H
-
 #include <stdint.h>
 #include <stdlib.h>
 
@@ -542,5 +541,4 @@ class DSMEPlatform : public IDSMEPlatform {
 }
 #endif
 
-#endif /* OPENDSME_DSMEPLATFORM_H */
 /** @} */
diff --git a/pkg/opendsme/include/opendsme/dsme_atomic.h b/pkg/opendsme/include/opendsme/dsme_atomic.h
index 88578188d007..1312f489c27e 100644
--- a/pkg/opendsme/include/opendsme/dsme_atomic.h
+++ b/pkg/opendsme/include/opendsme/dsme_atomic.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_opendsme
  *
@@ -16,9 +18,6 @@
  * @author      José I. Álamos <jose.alamos@haw-hamburg.de>
  */
 
-#ifndef OPENDSME_DSME_ATOMIC_H
-#define OPENDSME_DSME_ATOMIC_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -37,7 +36,6 @@ extern "C" {
  */
 #define dsme_atomicEnd()
 
-#endif /* OPENDSME_DSME_ATOMIC_H */
 
 #ifdef __cplusplus
 }
diff --git a/pkg/opendsme/include/opendsme/dsme_platform.h b/pkg/opendsme/include/opendsme/dsme_platform.h
index 32fde2b99793..7246aa371044 100644
--- a/pkg/opendsme/include/opendsme/dsme_platform.h
+++ b/pkg/opendsme/include/opendsme/dsme_platform.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_opendsme
  *
@@ -16,9 +18,6 @@
  * @author      José I. Álamos <jose.alamos@haw-hamburg.de>
  */
 
-#ifndef OPENDSME_DSME_PLATFORM_H
-#define OPENDSME_DSME_PLATFORM_H
-
 #include <assert.h>
 #include <stdio.h>
 
@@ -48,5 +47,4 @@ extern "C" {
 }
 #endif
 
-#endif /* OPENDSME_DSME_PLATFORM_H */
 /** @} */
diff --git a/pkg/opendsme/include/opendsme/dsme_settings.h b/pkg/opendsme/include/opendsme/dsme_settings.h
index 335ffba74f74..b3f6d49e0815 100644
--- a/pkg/opendsme/include/opendsme/dsme_settings.h
+++ b/pkg/opendsme/include/opendsme/dsme_settings.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_opendsme
  *
@@ -15,8 +17,6 @@
  *
  * @author      José I. Álamos <jose.alamos@haw-hamburg.de>
  */
-#ifndef OPENDSME_DSME_SETTINGS_H
-#define OPENDSME_DSME_SETTINGS_H
 
 #include <stdint.h>
 
@@ -162,5 +162,4 @@ constexpr uint8_t ADDITIONAL_ACK_WAIT_DURATION = 63;
 }
 #endif
 
-#endif /* OPENDSME_DSME_SETTINGS_H */
 /** @} */
diff --git a/pkg/opendsme/include/opendsme/opendsme.h b/pkg/opendsme/include/opendsme/opendsme.h
index f63930fa004b..f6419a6e4884 100644
--- a/pkg/opendsme/include/opendsme/opendsme.h
+++ b/pkg/opendsme/include/opendsme/opendsme.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_opendsme openDSME - IEEE 802.15.4 DSME
  * @ingroup     pkg
@@ -184,8 +186,6 @@
  * ## MAC configuration
  *
  */
-#ifndef OPENDSME_OPENDSME_H
-#define OPENDSME_OPENDSME_H
 
 #include <stdbool.h>
 #include "byteorder.h"
@@ -279,6 +279,5 @@ int gnrc_netif_opendsme_create(gnrc_netif_t *netif, char *stack, int stacksize,
 }
 #endif
 
-#endif /* OPENDSME_OPENDSME_H */
 
 /** @} */
diff --git a/pkg/openthread/include/ot.h b/pkg/openthread/include/ot.h
index 53db7bd06329..e77bdbe08b23 100644
--- a/pkg/openthread/include/ot.h
+++ b/pkg/openthread/include/ot.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_openthread_cli   OpenThread
  * @ingroup     pkg_openthread
@@ -50,9 +52,6 @@
  * @author      Baptiste Clenet <bapclenet@gmail.com>
  */
 
-#ifndef OT_H
-#define OT_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -168,5 +167,4 @@ void ot_random_init(void);
 }
 #endif
 
-#endif /* OT_H */
 /** @} */
diff --git a/pkg/openthread/include/platform_config.h b/pkg/openthread/include/platform_config.h
index c1e1b81d118c..472497df1e5f 100644
--- a/pkg/openthread/include/platform_config.h
+++ b/pkg/openthread/include/platform_config.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @{
  * @ingroup     net
@@ -16,9 +18,6 @@
  * @}
  */
 
-#ifndef PLATFORM_CONFIG_H
-#define PLATFORM_CONFIG_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -46,5 +45,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* PLATFORM_CONFIG_H */
diff --git a/pkg/openwsn/include/board_info.h b/pkg/openwsn/include/board_info.h
index 805ff3954947..03f9a42d8313 100644
--- a/pkg/openwsn/include/board_info.h
+++ b/pkg/openwsn/include/board_info.h
@@ -7,6 +7,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_openwsn
  * @{
@@ -21,9 +23,6 @@
  * @}
  */
 
-#ifndef BOARD_INFO_H
-#define BOARD_INFO_H
-
 #include <stdint.h>
 #include <string.h>
 
@@ -144,5 +143,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* BOARD_INFO_H */
diff --git a/pkg/openwsn/include/openwsn.h b/pkg/openwsn/include/openwsn.h
index 0970af95d5c3..e3b6f83f271c 100644
--- a/pkg/openwsn/include/openwsn.h
+++ b/pkg/openwsn/include/openwsn.h
@@ -7,6 +7,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_openwsn
  *
@@ -17,8 +19,6 @@
  * @author      Peter Kietzmann <peter.kietzmann@haw-hamburg.de>
  * @author      Francisco Molina <francois-xavier.molina@inria.fr>
  */
-#ifndef OPENWSN_H
-#define OPENWSN_H
 
 #ifdef __cplusplus
 extern "C" {
@@ -61,5 +61,4 @@ kernel_pid_t openwsn_get_pid(void);
 }
 #endif
 
-#endif /* OPENWSN_H */
 /** @} */
diff --git a/pkg/openwsn/include/openwsn_board.h b/pkg/openwsn/include/openwsn_board.h
index 5814662dc7a4..6c025f75ef90 100644
--- a/pkg/openwsn/include/openwsn_board.h
+++ b/pkg/openwsn/include/openwsn_board.h
@@ -7,6 +7,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_openwsn
  * @{
@@ -24,9 +26,6 @@
  * @}
  */
 
-#ifndef OPENWSN_BOARD_H
-#define OPENWSN_BOARD_H
-
 #include "board_info.h"
 
 #ifdef __cplusplus
@@ -67,5 +66,3 @@ void board_sleep(void);
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* OPENWSN_BOARD_H */
diff --git a/pkg/openwsn/include/openwsn_debugpins.h b/pkg/openwsn/include/openwsn_debugpins.h
index 32832a7d1772..0d6d85841882 100644
--- a/pkg/openwsn/include/openwsn_debugpins.h
+++ b/pkg/openwsn/include/openwsn_debugpins.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_openwsn
  * @{
@@ -20,9 +22,6 @@
  * @}
  */
 
-#ifndef OPENWSN_DEBUGPINS_H
-#define OPENWSN_DEBUGPINS_H
-
 #include "periph/gpio.h"
 
 #ifdef __cplusplus
@@ -52,5 +51,3 @@ void openwsn_debugpins_init(const debugpins_config_t *user_config);
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* OPENWSN_DEBUGPINS_H */
diff --git a/pkg/openwsn/include/openwsn_debugpins_params.h b/pkg/openwsn/include/openwsn_debugpins_params.h
index e3df46238e0b..ae4fe05c10b3 100644
--- a/pkg/openwsn/include/openwsn_debugpins_params.h
+++ b/pkg/openwsn/include/openwsn_debugpins_params.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_openwsn
  * @{
@@ -19,9 +21,6 @@
  * @}
  */
 
-#ifndef OPENWSN_DEBUGPINS_PARAMS_H
-#define OPENWSN_DEBUGPINS_PARAMS_H
-
 #include "board.h"
 #include "openwsn_debugpins.h"
 
@@ -77,5 +76,3 @@ static const debugpins_config_t openwsn_debugpins_params[] =
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* OPENWSN_DEBUGPINS_PARAMS_H */
diff --git a/pkg/openwsn/include/openwsn_leds.h b/pkg/openwsn/include/openwsn_leds.h
index 17774ede2784..46abeb27c85a 100644
--- a/pkg/openwsn/include/openwsn_leds.h
+++ b/pkg/openwsn/include/openwsn_leds.h
@@ -7,6 +7,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_openwsn
  * @{
@@ -20,8 +22,6 @@
  *
  * @}
  */
-#ifndef OPENWSN_LEDS_H
-#define OPENWSN_LEDS_H
 
 #include "periph/gpio.h"
 
@@ -62,5 +62,3 @@ void ledpins_riot_init(const leds_config_t *user_config);
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* OPENWSN_LEDS_H */
diff --git a/pkg/openwsn/include/openwsn_leds_params.h b/pkg/openwsn/include/openwsn_leds_params.h
index c4f81dfed5c2..4b37c42af5ae 100644
--- a/pkg/openwsn/include/openwsn_leds_params.h
+++ b/pkg/openwsn/include/openwsn_leds_params.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_openwsn
  * @{
@@ -17,8 +19,6 @@
  *
  * @}
  */
-#ifndef OPENWSN_LEDS_PARAMS_H
-#define OPENWSN_LEDS_PARAMS_H
 
 #include "board.h"
 
@@ -92,5 +92,3 @@ static const leds_config_t openwsn_leds_params[] =
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* OPENWSN_LEDS_PARAMS_H */
diff --git a/pkg/openwsn/include/openwsn_log.h b/pkg/openwsn/include/openwsn_log.h
index ef73c348c46d..1618857a2db1 100644
--- a/pkg/openwsn/include/openwsn_log.h
+++ b/pkg/openwsn/include/openwsn_log.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_openwsn
  * @{
@@ -19,9 +21,6 @@
  * @author      Kaspar Schleiser <kaspar@schleiser.de>
  */
 
-#ifndef OPENWSN_LOG_H
-#define OPENWSN_LOG_H
-
 #include <stdio.h>
 
 #ifdef __cplusplus
@@ -95,5 +94,4 @@ enum {
 }
 #endif
 
-#endif /* OPENWSN_LOG_H */
 /** @} */
diff --git a/pkg/openwsn/include/openwsn_radio.h b/pkg/openwsn/include/openwsn_radio.h
index 3f8019367594..6c85471d54dc 100644
--- a/pkg/openwsn/include/openwsn_radio.h
+++ b/pkg/openwsn/include/openwsn_radio.h
@@ -7,6 +7,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_openwsn
  * @{
@@ -45,9 +47,6 @@
  * @author      Francisco Molina <francois-xavier.molina@inria.fr>
  */
 
-#ifndef OPENWSN_RADIO_H
-#define OPENWSN_RADIO_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -83,5 +82,4 @@ typedef struct {
 }
 #endif
 
-#endif /* OPENWSN_RADIO_H */
 /** @} */
diff --git a/pkg/openwsn/include/openwsn_uart.h b/pkg/openwsn/include/openwsn_uart.h
index a41c65c16df3..468b3a6503ac 100644
--- a/pkg/openwsn/include/openwsn_uart.h
+++ b/pkg/openwsn/include/openwsn_uart.h
@@ -7,6 +7,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_openwsn
  * @{
@@ -23,9 +25,6 @@
  * @}
  */
 
-#ifndef OPENWSN_UART_H
-#define OPENWSN_UART_H
-
 #include "stdint.h"
 #include "board.h"
 #include "periph_conf.h"
@@ -138,5 +137,3 @@ void    uart_clearTxInterrupts(void);
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* OPENWSN_UART_H */
diff --git a/pkg/openwsn/scheduler/scheduler_types.h b/pkg/openwsn/scheduler/scheduler_types.h
index 0dbfa7267de5..4ec35d13a2ac 100644
--- a/pkg/openwsn/scheduler/scheduler_types.h
+++ b/pkg/openwsn/scheduler/scheduler_types.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_openwsn
  * @{
@@ -19,9 +21,6 @@
  * @}
  */
 
-#ifndef SCHEDULER_TYPES_H
-#define SCHEDULER_TYPES_H
-
 #include "opendefs.h"
 #include "scheduler.h"
 #include "event/callback.h"
@@ -52,5 +51,3 @@ typedef struct {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* SCHEDULER_TYPES_H */
diff --git a/pkg/openwsn/sock/sock_types.h b/pkg/openwsn/sock/sock_types.h
index 776a159d0320..b167abcf98be 100644
--- a/pkg/openwsn/sock/sock_types.h
+++ b/pkg/openwsn/sock/sock_types.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup pkg_openwsn_sock OpenWSN-specific implementation of the sock API
  * @ingroup  pkg_openwsn
@@ -20,9 +22,6 @@
  * @author  Francisco Molina <francois-xavier.molina@inria.fr>
  */
 
-#ifndef SOCK_TYPES_H
-#define SOCK_TYPES_H
-
 #include "mbox.h"
 #include "net/af.h"
 #ifdef SOCK_HAS_ASYNC
@@ -94,5 +93,4 @@ struct sock_udp {
 }
 #endif
 
-#endif /* SOCK_TYPES_H */
 /** @} */
diff --git a/pkg/paho-mqtt/include/paho_mqtt.h b/pkg/paho-mqtt/include/paho_mqtt.h
index 07e2e0010f2a..656d52368e3a 100644
--- a/pkg/paho-mqtt/include/paho_mqtt.h
+++ b/pkg/paho-mqtt/include/paho_mqtt.h
@@ -7,6 +7,8 @@
  *
  */
 
+#pragma once
+
 /**
  * @addtogroup  pkg_paho_mqtt
  * @{
@@ -16,8 +18,6 @@
  *
  * @author      Javier FILEIV <javier.fileiv@gmail.com>
  */
-#ifndef PAHO_MQTT_H
-#define PAHO_MQTT_H
 
 #include "mutex.h"
 #include "thread.h"
@@ -193,5 +193,4 @@ int ThreadStart(Thread *thread, void (*fn)(void *), void *arg);
 }
 #endif
 
-#endif /* PAHO_MQTT_H */
 /** @} */
diff --git a/pkg/semtech-loramac/include/semtech-loramac/timer.h b/pkg/semtech-loramac/include/semtech-loramac/timer.h
index 54e01a438060..4a808b595c32 100644
--- a/pkg/semtech-loramac/include/semtech-loramac/timer.h
+++ b/pkg/semtech-loramac/include/semtech-loramac/timer.h
@@ -7,6 +7,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup         pkg_semtech-loramac
  * @brief           Semtech LoRaMAC timer compatibility definitions
@@ -19,9 +21,6 @@
  * @author          Francisco Molina <francisco.molina@inria.cl>
  */
 
-#ifndef SEMTECH_LORAMAC_TIMER_H
-#define SEMTECH_LORAMAC_TIMER_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -126,5 +125,4 @@ void TimerLowPowerHandler(void);
 }
 #endif
 
-#endif /* SEMTECH_LORAMAC_TIMER_H */
 /** @} */
diff --git a/pkg/semtech-loramac/include/semtech_loramac.h b/pkg/semtech-loramac/include/semtech_loramac.h
index 656454f55e3c..72340e5f22e3 100644
--- a/pkg/semtech-loramac/include/semtech_loramac.h
+++ b/pkg/semtech-loramac/include/semtech_loramac.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup         pkg_semtech-loramac
  * @brief           Public API and definitions of the Semtech LoRaMAC
@@ -16,9 +18,6 @@
  * @author          Alexandre Abadie <alexandre.abadie@inria.fr>
  */
 
-#ifndef SEMTECH_LORAMAC_H
-#define SEMTECH_LORAMAC_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -567,5 +566,4 @@ void semtech_loramac_erase_config(void);
 }
 #endif
 
-#endif /* SEMTECH_LORAMAC_H */
 /** @} */
diff --git a/pkg/spiffs/include/spiffs_config.h b/pkg/spiffs/include/spiffs_config.h
index c9a86109f9a3..1da209bd5739 100644
--- a/pkg/spiffs/include/spiffs_config.h
+++ b/pkg/spiffs/include/spiffs_config.h
@@ -21,6 +21,8 @@
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
+#pragma once
+
 /*
  * spiffs_config.h
  *
@@ -28,9 +30,6 @@
  *      Author: petera
  */
 
-#ifndef SPIFFS_CONFIG_H
-#define SPIFFS_CONFIG_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -349,5 +348,3 @@ typedef int16_t s16_t;
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* SPIFFS_CONFIG_H */
diff --git a/pkg/tinydtls/include/sock_dtls_types.h b/pkg/tinydtls/include/sock_dtls_types.h
index e800bab72f2a..4280aaf0278f 100644
--- a/pkg/tinydtls/include/sock_dtls_types.h
+++ b/pkg/tinydtls/include/sock_dtls_types.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @{
  *
@@ -16,9 +18,6 @@
  * @author  Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
  */
 
-#ifndef SOCK_DTLS_TYPES_H
-#define SOCK_DTLS_TYPES_H
-
 #include "dtls.h"
 #include "net/sock/udp.h"
 #include "net/credman.h"
@@ -94,5 +93,4 @@ struct sock_dtls_session {
 }
 #endif
 
-#endif /* SOCK_DTLS_TYPES_H */
 /** @} */
diff --git a/pkg/tinyusb/contrib/include/tinyusb.h b/pkg/tinyusb/contrib/include/tinyusb.h
index 34679c696eea..ad1b2381a51a 100644
--- a/pkg/tinyusb/contrib/include/tinyusb.h
+++ b/pkg/tinyusb/contrib/include/tinyusb.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_tinyusb
  * @{
@@ -16,9 +18,6 @@
  * @author      Gunar Schorcht <gunar@schorcht.net>
  */
 
-#ifndef TINYUSB_H
-#define TINYUSB_H
-
 #include "periph_conf.h"
 #include "tinyusb_hw_defaults.h"
 
@@ -63,5 +62,4 @@ int tinyusb_setup(void);
 }
 #endif
 
-#endif /* TINYUSB_H */
 /** @} */
diff --git a/pkg/tinyusb/contrib/include/tinyusb_descriptors.h b/pkg/tinyusb/contrib/include/tinyusb_descriptors.h
index 92b909a83aa9..d5e5e7c2221c 100644
--- a/pkg/tinyusb/contrib/include/tinyusb_descriptors.h
+++ b/pkg/tinyusb/contrib/include/tinyusb_descriptors.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_tinyusb
  * @{
@@ -16,9 +18,6 @@
  * @author      Gunar Schorcht <gunar@schorcht.net>
  */
 
-#ifndef TINYUSB_DESCRIPTORS_H
-#define TINYUSB_DESCRIPTORS_H
-
 #include "tusb_config.h"        /* defined by the application */
 #include "tinyusb.h"
 
@@ -205,5 +204,4 @@ enum {
 #endif
 
 #endif /* !DOXYGEN */
-#endif /* TINYUSB_DESCRIPTORS_H */
 /** @} */
diff --git a/pkg/tinyusb/contrib/include/tusb_config.h b/pkg/tinyusb/contrib/include/tusb_config.h
index 14b2660e6569..c348591195fa 100644
--- a/pkg/tinyusb/contrib/include/tusb_config.h
+++ b/pkg/tinyusb/contrib/include/tusb_config.h
@@ -21,6 +21,8 @@
  * THE SOFTWARE.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_tinyusb
  * @{
@@ -31,9 +33,6 @@
  * @author      Gunar Schorcht <gunar@schorcht.net>
  */
 
-#ifndef TUSB_CONFIG_H
-#define TUSB_CONFIG_H
-
 /* defined by the application */
 #if __has_include("tinyusb_app_config.h")
 #include "tinyusb_app_config.h"
@@ -464,5 +463,4 @@ extern "C" {
 #endif
 
 #endif /* !DOXYGEN */
-#endif /* TUSB_CONFIG_H */
 /** @} */
diff --git a/pkg/tinyusb/contrib/include/tusb_os_custom.h b/pkg/tinyusb/contrib/include/tusb_os_custom.h
index 901dcac784dd..c79dbddf4457 100644
--- a/pkg/tinyusb/contrib/include/tusb_os_custom.h
+++ b/pkg/tinyusb/contrib/include/tusb_os_custom.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_tinyusb
  * @{
@@ -16,9 +18,6 @@
  * @author      Gunar Schorcht <gunar@schorcht.net>
  */
 
-#ifndef TUSB_OS_CUSTOM_H
-#define TUSB_OS_CUSTOM_H
-
 #include "mutex.h"
 #include "sema.h"
 #include "ztimer.h"
@@ -252,5 +251,4 @@ TU_ATTR_ALWAYS_INLINE static inline bool osal_queue_empty(osal_queue_t qhdl)
 #endif
 
 #endif /* !DOXYGEN */
-#endif /* TUSB_OS_CUSTOM_H */
 /** @} */
diff --git a/pkg/tinyusb/dfu/include/tinyusb_dfu.h b/pkg/tinyusb/dfu/include/tinyusb_dfu.h
index e03a2bd76b75..6231eab9f4a8 100644
--- a/pkg/tinyusb/dfu/include/tinyusb_dfu.h
+++ b/pkg/tinyusb/dfu/include/tinyusb_dfu.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_tinyusb_dfu
  * @{
@@ -15,9 +17,6 @@
  * @author      Gunar Schorcht <gunar@schorcht.net>
  */
 
-#ifndef TINYUSB_DFU_H
-#define TINYUSB_DFU_H
-
 #include "riotboot/flashwrite.h"
 
 #ifdef __cplusplus
@@ -44,5 +43,4 @@ void tinyusb_dfu_init(void);
 }
 #endif
 
-#endif /* TINYUSB_DFU_H */
 /** @} */
diff --git a/pkg/tinyusb/hw/include/nrf52/nrf_clock.h b/pkg/tinyusb/hw/include/nrf52/nrf_clock.h
index cf76aa3b0bc6..e0d0c84fee68 100644
--- a/pkg/tinyusb/hw/include/nrf52/nrf_clock.h
+++ b/pkg/tinyusb/hw/include/nrf52/nrf_clock.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_tinyusb
  * @brief
@@ -20,9 +22,6 @@
  * @author      Gunar Schorcht <gunar@schorcht.net>
  */
 
-#ifndef NRF52_NRF_CLOCK_H
-#define NRF52_NRF_CLOCK_H
-
 #include <stdbool.h>
 
 #include "nrf.h"
@@ -105,5 +104,4 @@ static inline void nrf_clock_task_trigger(NRF_CLOCK_Type *reg,
 #endif
 
 #endif /* !DOXYGEN */
-#endif /* NRF52_NRF_CLOCK_H */
 /** @} */
diff --git a/pkg/tinyusb/hw/include/tinyusb_hw.h b/pkg/tinyusb/hw/include/tinyusb_hw.h
index 40c4654afd8d..7a0e7699ee88 100644
--- a/pkg/tinyusb/hw/include/tinyusb_hw.h
+++ b/pkg/tinyusb/hw/include/tinyusb_hw.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_tinyusb
  * @{
@@ -16,9 +18,6 @@
  * @author      Gunar Schorcht <gunar@schorcht.net>
  */
 
-#ifndef TINYUSB_HW_H
-#define TINYUSB_HW_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -37,5 +36,4 @@ int tinyusb_hw_init(void);
 }
 #endif
 
-#endif /* TINYUSB_HW_H */
 /** @} */
diff --git a/pkg/tinyusb/hw/include/tinyusb_hw_defaults.h b/pkg/tinyusb/hw/include/tinyusb_hw_defaults.h
index 99f0dcd8f0fa..b68e5ad852f9 100644
--- a/pkg/tinyusb/hw/include/tinyusb_hw_defaults.h
+++ b/pkg/tinyusb/hw/include/tinyusb_hw_defaults.h
@@ -20,6 +20,8 @@
  * THE SOFTWARE.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_tinyusb
  * @{
@@ -36,9 +38,6 @@
  * @author      Gunar Schorcht <gunar@schorcht.net>
  */
 
-#ifndef TINYUSB_HW_DEFAULTS_H
-#define TINYUSB_HW_DEFAULTS_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -47,5 +46,4 @@ extern "C" {
 }
 #endif
 
-#endif /* TINYUSB_HW_DEFAULTS_H */
 /** @} */
diff --git a/pkg/tinyusb/netdev/include/tinyusb_netdev.h b/pkg/tinyusb/netdev/include/tinyusb_netdev.h
index c26e0cf149d4..c8edc736d6ba 100644
--- a/pkg/tinyusb/netdev/include/tinyusb_netdev.h
+++ b/pkg/tinyusb/netdev/include/tinyusb_netdev.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @defgroup    pkg_tinyusb_netdev TinyUSB netdev driver
  * @ingroup     pkg_tinyusb
@@ -56,9 +58,6 @@
  * @author      Gunar Schorcht <gunar@schorcht.net>
  */
 
-#ifndef TINYUSB_NETDEV_H
-#define TINYUSB_NETDEV_H
-
 #include "net/ethernet.h"
 #include "net/netdev.h"
 #include "mutex.h"
@@ -88,5 +87,4 @@ typedef struct {
 }
 #endif
 
-#endif /* TINYUSB_NETDEV_H */
 /** @} */
diff --git a/pkg/tinyvcdiff/include/vcdiff_mtd.h b/pkg/tinyvcdiff/include/vcdiff_mtd.h
index c55026480345..f9b6b46c746d 100644
--- a/pkg/tinyvcdiff/include/vcdiff_mtd.h
+++ b/pkg/tinyvcdiff/include/vcdiff_mtd.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @{
  *
@@ -15,9 +17,6 @@
  * @author  Juergen Fitschen <me@jue.yt>
  */
 
-#ifndef VCDIFF_MTD_H
-#define VCDIFF_MTD_H
-
 #include "vcdiff.h"
 #include "mtd.h"
 
@@ -71,5 +70,4 @@ typedef struct {
 }
 #endif
 
-#endif /* VCDIFF_MTD_H */
 /** @} */
diff --git a/pkg/tinyvcdiff/include/vcdiff_vfs.h b/pkg/tinyvcdiff/include/vcdiff_vfs.h
index a7bdeee7ef1c..c956af1d6bed 100644
--- a/pkg/tinyvcdiff/include/vcdiff_vfs.h
+++ b/pkg/tinyvcdiff/include/vcdiff_vfs.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @{
  *
@@ -15,9 +17,6 @@
  * @author  Juergen Fitschen <me@jue.yt>
  */
 
-#ifndef VCDIFF_VFS_H
-#define VCDIFF_VFS_H
-
 #include "vcdiff.h"
 #include "vfs.h"
 
@@ -52,5 +51,4 @@ typedef struct {
 }
 #endif
 
-#endif /* VCDIFF_VFS_H */
 /** @} */
diff --git a/pkg/tlsf/contrib/include/tlsf-malloc.h b/pkg/tlsf/contrib/include/tlsf-malloc.h
index e6fd4fd5ad10..666368c4304b 100644
--- a/pkg/tlsf/contrib/include/tlsf-malloc.h
+++ b/pkg/tlsf/contrib/include/tlsf-malloc.h
@@ -5,6 +5,9 @@
  * General Public License v2.1. See the file LICENSE in the top level
  * directory for more details.
  */
+
+#pragma once
+
 /**
  * @defgroup pkg_tlsf_malloc TLSF-based malloc.
  * @ingroup  pkg
@@ -33,9 +36,6 @@
  *
  */
 
-#ifndef TLSF_MALLOC_H
-#define TLSF_MALLOC_H
-
 #include <stddef.h>
 
 #include "tlsf.h"
@@ -93,7 +93,6 @@ tlsf_t _tlsf_get_global_control(void);
 }
 #endif
 
-#endif /* TLSF_MALLOC_H */
 
 /**
  * @}
diff --git a/pkg/tlsf/contrib/tlsf-malloc-internal.h b/pkg/tlsf/contrib/tlsf-malloc-internal.h
index dd587132725a..245b9e7b3837 100644
--- a/pkg/tlsf/contrib/tlsf-malloc-internal.h
+++ b/pkg/tlsf/contrib/tlsf-malloc-internal.h
@@ -5,6 +5,9 @@
  * General Public License v2.1. See the file LICENSE in the top level
  * directory for more details.
  */
+
+#pragma once
+
 /**
  * @ingroup  pkg_tlsf_malloc
  * @{
@@ -16,9 +19,6 @@
  *
  */
 
-#ifndef TLSF_MALLOC_INTERNAL_H
-#define TLSF_MALLOC_INTERNAL_H
-
 #include "tlsf.h"
 
 #ifdef __cplusplus
@@ -31,5 +31,4 @@ extern tlsf_t tlsf_malloc_gheap;
 }
 #endif
 
-#endif /* TLSF_MALLOC_INTERNAL_H */
 /** @} */
diff --git a/pkg/u8g2/contrib/u8x8_riotos.h b/pkg/u8g2/contrib/u8x8_riotos.h
index 1b0a7f5a0b78..16748d454b55 100644
--- a/pkg/u8g2/contrib/u8x8_riotos.h
+++ b/pkg/u8g2/contrib/u8x8_riotos.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_u8g2
  * @{
@@ -19,9 +21,6 @@
  * @}
  */
 
-#ifndef U8X8_RIOTOS_H
-#define U8X8_RIOTOS_H
-
 #include "u8x8.h"
 
 #include "periph/gpio.h"
@@ -66,5 +65,3 @@ uint8_t u8x8_byte_hw_i2c_riotos(u8x8_t *u8g2, uint8_t msg, uint8_t arg_int, void
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* U8X8_RIOTOS_H */
diff --git a/pkg/ucglib/contrib/ucg_riotos.h b/pkg/ucglib/contrib/ucg_riotos.h
index 9e6c87069b1b..49d5a9ce904d 100644
--- a/pkg/ucglib/contrib/ucg_riotos.h
+++ b/pkg/ucglib/contrib/ucg_riotos.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_ucglib
  * @{
@@ -19,9 +21,6 @@
  * @}
  */
 
-#ifndef UCG_RIOTOS_H
-#define UCG_RIOTOS_H
-
 #include "ucg.h"
 
 #include "periph/gpio.h"
@@ -61,5 +60,3 @@ ucg_int_t ucg_dev_dummy_riotos(ucg_t *ucg, ucg_int_t msg, void *data);
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* UCG_RIOTOS_H */
diff --git a/pkg/uwb-core/include/dpl/dpl.h b/pkg/uwb-core/include/dpl/dpl.h
index 309ea1343b20..1bb10ca8d713 100644
--- a/pkg/uwb-core/include/dpl/dpl.h
+++ b/pkg/uwb-core/include/dpl/dpl.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef DPL_DPL_H
-#define DPL_DPL_H
-
 #include "syscfg/syscfg.h"
 #include "dpl/dpl_types.h"
 #include "dpl/dpl_error.h"
@@ -35,5 +34,3 @@
 #ifdef __cplusplus
 extern "C" {
 #endif
-
-#endif /* DPL_DPL_H */
diff --git a/pkg/uwb-core/include/dpl/dpl_callout.h b/pkg/uwb-core/include/dpl/dpl_callout.h
index b52423834762..d544701abafc 100644
--- a/pkg/uwb-core/include/dpl/dpl_callout.h
+++ b/pkg/uwb-core/include/dpl/dpl_callout.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -20,9 +22,6 @@
  * @}
  */
 
-#ifndef DPL_DPL_CALLOUT_H
-#define DPL_DPL_CALLOUT_H
-
 #include "os/os_callout.h"
 
 #ifdef __cplusplus
@@ -82,5 +81,3 @@ static inline void dpl_callout_stop(struct dpl_callout *c)
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* DPL_DPL_CALLOUT_H */
diff --git a/pkg/uwb-core/include/dpl/dpl_cputime.h b/pkg/uwb-core/include/dpl/dpl_cputime.h
index e299fbd42941..ee171bb88616 100644
--- a/pkg/uwb-core/include/dpl/dpl_cputime.h
+++ b/pkg/uwb-core/include/dpl/dpl_cputime.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef DPL_DPL_CPUTIME_H
-#define DPL_DPL_CPUTIME_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -145,5 +144,3 @@ static inline void dpl_cputime_timer_stop(struct hal_timer *timer)
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* DPL_DPL_CPUTIME_H */
diff --git a/pkg/uwb-core/include/dpl/dpl_error.h b/pkg/uwb-core/include/dpl/dpl_error.h
index 24c46e60ea67..157b0c37a7b5 100644
--- a/pkg/uwb-core/include/dpl/dpl_error.h
+++ b/pkg/uwb-core/include/dpl/dpl_error.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef DPL_DPL_ERROR_H
-#define DPL_DPL_ERROR_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -53,5 +52,3 @@ typedef os_error_t dpl_error_t;
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* DPL_DPL_ERROR_H */
diff --git a/pkg/uwb-core/include/dpl/dpl_eventq.h b/pkg/uwb-core/include/dpl/dpl_eventq.h
index 1a3475c0cec2..cdc62b694d67 100644
--- a/pkg/uwb-core/include/dpl/dpl_eventq.h
+++ b/pkg/uwb-core/include/dpl/dpl_eventq.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef DPL_DPL_EVENTQ_H
-#define DPL_DPL_EVENTQ_H
-
 #include <dpl/dpl_types.h>
 
 #include "os/os_eventq.h"
@@ -219,5 +218,3 @@ static inline struct dpl_eventq * dpl_eventq_dflt_get(void)
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* DPL_DPL_EVENTQ_H */
diff --git a/pkg/uwb-core/include/dpl/dpl_mutex.h b/pkg/uwb-core/include/dpl/dpl_mutex.h
index cb38b4f7db54..4fbb738e2604 100644
--- a/pkg/uwb-core/include/dpl/dpl_mutex.h
+++ b/pkg/uwb-core/include/dpl/dpl_mutex.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef DPL_DPL_MUTEX_H
-#define DPL_DPL_MUTEX_H
-
 #include "os/os_mutex.h"
 
 #ifdef __cplusplus
@@ -76,5 +75,3 @@ static inline dpl_error_t dpl_mutex_release(struct dpl_mutex *mu)
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* DPL_DPL_MUTEX_H */
diff --git a/pkg/uwb-core/include/dpl/dpl_os.h b/pkg/uwb-core/include/dpl/dpl_os.h
index adfdcd5b997d..59f74e4b63f4 100644
--- a/pkg/uwb-core/include/dpl/dpl_os.h
+++ b/pkg/uwb-core/include/dpl/dpl_os.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef DPL_DPL_OS_H
-#define DPL_DPL_OS_H
-
 #include "os/os.h"
 
 #ifdef __cplusplus
@@ -73,5 +72,3 @@ static inline bool dpl_hw_is_in_critical(void)
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* DPL_DPL_OS_H */
diff --git a/pkg/uwb-core/include/dpl/dpl_sem.h b/pkg/uwb-core/include/dpl/dpl_sem.h
index 5c8dfadfdef5..563ecc1e27e2 100644
--- a/pkg/uwb-core/include/dpl/dpl_sem.h
+++ b/pkg/uwb-core/include/dpl/dpl_sem.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef DPL_DPL_SEM_H
-#define DPL_DPL_SEM_H
-
 #include <stdint.h>
 
 #include "dpl_types.h"
@@ -96,5 +95,3 @@ static inline int16_t dpl_sem_get_count(struct dpl_sem *sem)
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* DPL_DPL_SEM_H */
diff --git a/pkg/uwb-core/include/dpl/dpl_tasks.h b/pkg/uwb-core/include/dpl/dpl_tasks.h
index e92b7442e86c..06797ea366c5 100644
--- a/pkg/uwb-core/include/dpl/dpl_tasks.h
+++ b/pkg/uwb-core/include/dpl/dpl_tasks.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef DPL_DPL_TASKS_H
-#define DPL_DPL_TASKS_H
-
 #include "os/os_task.h"
 
 #ifdef __cplusplus
@@ -94,5 +93,3 @@ static inline void dpl_task_yield(void)
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* DPL_DPL_TASKS_H */
diff --git a/pkg/uwb-core/include/dpl/dpl_time.h b/pkg/uwb-core/include/dpl/dpl_time.h
index 4432bf1ea927..6259dea8fb8c 100644
--- a/pkg/uwb-core/include/dpl/dpl_time.h
+++ b/pkg/uwb-core/include/dpl/dpl_time.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef DPL_DPL_TIME_H
-#define DPL_DPL_TIME_H
-
 #include "os/os_time.h"
 
 #ifdef __cplusplus
@@ -99,5 +98,3 @@ static inline void dpl_time_delay(dpl_time_t ticks)
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* DPL_DPL_TIME_H */
diff --git a/pkg/uwb-core/include/dpl/dpl_types.h b/pkg/uwb-core/include/dpl/dpl_types.h
index 4009bf0c89db..d552c1e80787 100644
--- a/pkg/uwb-core/include/dpl/dpl_types.h
+++ b/pkg/uwb-core/include/dpl/dpl_types.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef DPL_DPL_TYPES_H
-#define DPL_DPL_TYPES_H
-
 #include <stdint.h>
 #include <math.h>
 
@@ -116,5 +115,3 @@ typedef double dpl_float64_t;
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* DPL_DPL_TYPES_H */
diff --git a/pkg/uwb-core/include/dpl/queue.h b/pkg/uwb-core/include/dpl/queue.h
index 84e9da9ae138..16e99706a8c4 100644
--- a/pkg/uwb-core/include/dpl/queue.h
+++ b/pkg/uwb-core/include/dpl/queue.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef DPL_QUEUE_H
-#define DPL_QUEUE_H
-
 #include "os/os_queue.h"
 
 #ifdef __cplusplus
@@ -29,5 +28,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* DPL_QUEUE_H */
diff --git a/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ds.h b/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ds.h
index 63297f5e2db4..227ae11f06e1 100644
--- a/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ds.h
+++ b/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ds.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -18,9 +20,6 @@
  * @}
  */
 
-#ifndef DPL_SYSCFG_SYSCFG_TWR_DS_H
-#define DPL_SYSCFG_SYSCFG_TWR_DS_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -49,5 +48,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* DPL_SYSCFG_SYSCFG_TWR_DS_H */
diff --git a/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ds_ext.h b/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ds_ext.h
index 9f42f64f5418..9594ed7fab6b 100644
--- a/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ds_ext.h
+++ b/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ds_ext.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -18,9 +20,6 @@
  * @}
  */
 
-#ifndef DPL_SYSCFG_SYSCFG_TWR_DS_EXT_H
-#define DPL_SYSCFG_SYSCFG_TWR_DS_EXT_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -49,5 +48,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* DPL_SYSCFG_SYSCFG_TWR_DS_EXT_H */
diff --git a/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ss.h b/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ss.h
index f8fe1f34b4ba..e137316abaef 100644
--- a/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ss.h
+++ b/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ss.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -18,9 +20,6 @@
  * @}
  */
 
-#ifndef DPL_SYSCFG_SYSCFG_TWR_SS_H
-#define DPL_SYSCFG_SYSCFG_TWR_SS_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -49,5 +48,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* DPL_SYSCFG_SYSCFG_TWR_SS_H */
diff --git a/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ss_ack.h b/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ss_ack.h
index d53ccf8af412..87aede07968c 100644
--- a/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ss_ack.h
+++ b/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ss_ack.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -18,9 +20,6 @@
  * @}
  */
 
-#ifndef DPL_SYSCFG_SYSCFG_TWR_SS_ACK_H
-#define DPL_SYSCFG_SYSCFG_TWR_SS_ACK_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -49,5 +48,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* DPL_SYSCFG_SYSCFG_TWR_SS_ACK_H */
diff --git a/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ss_ext.h b/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ss_ext.h
index bf1dd8fcd164..d6784aec658d 100644
--- a/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ss_ext.h
+++ b/pkg/uwb-core/include/dpl_syscfg/syscfg_twr_ss_ext.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -18,9 +20,6 @@
  * @}
  */
 
-#ifndef DPL_SYSCFG_SYSCFG_TWR_SS_EXT_H
-#define DPL_SYSCFG_SYSCFG_TWR_SS_EXT_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -49,5 +48,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* DPL_SYSCFG_SYSCFG_TWR_SS_EXT_H */
diff --git a/pkg/uwb-core/include/dpl_syscfg/syscfg_uwb.h b/pkg/uwb-core/include/dpl_syscfg/syscfg_uwb.h
index 3ebe026879ff..86bae6858c47 100644
--- a/pkg/uwb-core/include/dpl_syscfg/syscfg_uwb.h
+++ b/pkg/uwb-core/include/dpl_syscfg/syscfg_uwb.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -18,9 +20,6 @@
  * @}
  */
 
-#ifndef DPL_SYSCFG_SYSCFG_UWB_H
-#define DPL_SYSCFG_SYSCFG_UWB_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -140,5 +139,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* DPL_SYSCFG_SYSCFG_UWB_H */
diff --git a/pkg/uwb-core/include/dpl_syscfg/syscfg_uwb_rng.h b/pkg/uwb-core/include/dpl_syscfg/syscfg_uwb_rng.h
index d10f93ef7b55..0f032a52b3ae 100644
--- a/pkg/uwb-core/include/dpl_syscfg/syscfg_uwb_rng.h
+++ b/pkg/uwb-core/include/dpl_syscfg/syscfg_uwb_rng.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -18,9 +20,6 @@
  * @}
  */
 
-#ifndef DPL_SYSCFG_SYSCFG_UWB_RNG_H
-#define DPL_SYSCFG_SYSCFG_UWB_RNG_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -63,5 +62,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* DPL_SYSCFG_SYSCFG_UWB_RNG_H */
diff --git a/pkg/uwb-core/include/uwb_core.h b/pkg/uwb-core/include/uwb_core.h
index 48c3b636b25e..b9bed07bac2d 100644
--- a/pkg/uwb-core/include/uwb_core.h
+++ b/pkg/uwb-core/include/uwb_core.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  *
@@ -16,9 +18,6 @@
  * @author      Francisco Molina <francois-xavier.molina@inria.fr>
  */
 
-#ifndef UWB_CORE_H
-#define UWB_CORE_H
-
 #include <stdint.h>
 #include "event.h"
 #if IS_USED(MODULE_UWB_CORE_EVENT_THREAD)
@@ -69,5 +68,4 @@ event_queue_t *uwb_core_get_eventq(void);
 }
 #endif
 
-#endif /* UWB_CORE_H */
 /** @} */
diff --git a/pkg/uwb-dw1000/include/syscfg_uwb_dw1000.h b/pkg/uwb-dw1000/include/syscfg_uwb_dw1000.h
index 7e62e91bf124..06273f856aec 100644
--- a/pkg/uwb-dw1000/include/syscfg_uwb_dw1000.h
+++ b/pkg/uwb-dw1000/include/syscfg_uwb_dw1000.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -18,9 +20,6 @@
  * @}
  */
 
-#ifndef SYSCFG_UWB_DW1000_H
-#define SYSCFG_UWB_DW1000_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -116,5 +115,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* SYSCFG_UWB_DW1000_H */
diff --git a/pkg/uwb-dw1000/include/uwb_dw1000.h b/pkg/uwb-dw1000/include/uwb_dw1000.h
index 72eb617f8a52..05093b025693 100644
--- a/pkg/uwb-dw1000/include/uwb_dw1000.h
+++ b/pkg/uwb-dw1000/include/uwb_dw1000.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_dw1000
  *
@@ -17,8 +19,6 @@
  * @author      Francisco Molina <francois-xavier.molina@inria.fr>
  * @}
  */
-#ifndef UWB_DW1000_H
-#define UWB_DW1000_H
 
 #include <stdint.h>
 
@@ -91,5 +91,3 @@ void uwb_dw1000_update_config_from_otp(dw1000_dev_instance_t* dev);
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* UWB_DW1000_H */
diff --git a/pkg/uwb-dw1000/include/uwb_dw1000_config.h b/pkg/uwb-dw1000/include/uwb_dw1000_config.h
index 34bf95d06159..213ec44e3b5a 100644
--- a/pkg/uwb-dw1000/include/uwb_dw1000_config.h
+++ b/pkg/uwb-dw1000/include/uwb_dw1000_config.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_core
  * @{
@@ -17,9 +19,6 @@
  * @}
  */
 
-#ifndef UWB_DW1000_CONFIG_H
-#define UWB_DW1000_CONFIG_H
-
 #include "dw1000/dw1000_regs.h"
 
 #ifdef __cplusplus
@@ -269,5 +268,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* UWB_DW1000_CONFIG_H */
diff --git a/pkg/uwb-dw1000/include/uwb_dw1000_params.h b/pkg/uwb-dw1000/include/uwb_dw1000_params.h
index 11fc23ce6768..835dcc16a03d 100644
--- a/pkg/uwb-dw1000/include/uwb_dw1000_params.h
+++ b/pkg/uwb-dw1000/include/uwb_dw1000_params.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_uwb_dw1000
  *
@@ -16,9 +18,6 @@
  * @author      Francisco Molina <francois-xavier.molina@inria.fr>
  */
 
-#ifndef UWB_DW1000_PARAMS_H
-#define UWB_DW1000_PARAMS_H
-
 #include "board.h"
 #include "uwb_dw1000.h"
 #include "dpl/dpl_sem.h"
@@ -92,5 +91,4 @@ static const dw1000_params_t dw1000_params[] =
 }
 #endif
 
-#endif /* UWB_DW1000_PARAMS_H */
 /** @} */
diff --git a/pkg/wakaama/include/lwm2m_client.h b/pkg/wakaama/include/lwm2m_client.h
index 49c1e21c76db..504a9c883ba2 100644
--- a/pkg/wakaama/include/lwm2m_client.h
+++ b/pkg/wakaama/include/lwm2m_client.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_wakaama
  * @defgroup    lwm2m_client LwM2M Client using Wakaama
@@ -17,9 +19,6 @@
  * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
  */
 
-#ifndef LWM2M_CLIENT_H
-#define LWM2M_CLIENT_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -163,5 +162,4 @@ void lwm2m_client_remove_credential(credman_tag_t tag);
 }
 #endif
 
-#endif /* LWM2M_CLIENT_H */
 /** @} */
diff --git a/pkg/wakaama/include/lwm2m_client_config.h b/pkg/wakaama/include/lwm2m_client_config.h
index b6dd1e239b2f..0bae9f52c996 100644
--- a/pkg/wakaama/include/lwm2m_client_config.h
+++ b/pkg/wakaama/include/lwm2m_client_config.h
@@ -7,6 +7,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup      pkg_wakaama
  * @ingroup      config
@@ -23,9 +25,6 @@
  * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
  */
 
-#ifndef LWM2M_CLIENT_CONFIG_H
-#define LWM2M_CLIENT_CONFIG_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -109,5 +108,4 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-#endif /* LWM2M_CLIENT_CONFIG_H */
 /** @} */
diff --git a/pkg/wakaama/include/lwm2m_client_connection.h b/pkg/wakaama/include/lwm2m_client_connection.h
index 4d2a335bbc13..643055b63257 100644
--- a/pkg/wakaama/include/lwm2m_client_connection.h
+++ b/pkg/wakaama/include/lwm2m_client_connection.h
@@ -16,6 +16,9 @@
 *    Christian Manal - Ported to RIOT OS
 *
 *******************************************************************************/
+
+#pragma once
+
 /*
  * Copyright (C) 2018 Beduino Master Projekt - University of Bremen
  * Copyright (C) 2019 HAW Hamburg
@@ -37,9 +40,6 @@
  * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
  */
 
-#ifndef LWM2M_CLIENT_CONNECTION_H
-#define LWM2M_CLIENT_CONNECTION_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -86,5 +86,4 @@ int lwm2m_connection_handle_packet(lwm2m_client_connection_t *conn,
 }
 #endif
 
-#endif /* LWM2M_CLIENT_CONNECTION_H */
 /** @} */
diff --git a/pkg/wakaama/include/lwm2m_client_objects.h b/pkg/wakaama/include/lwm2m_client_objects.h
index fe510b7b0f3f..627f2e1467b5 100644
--- a/pkg/wakaama/include/lwm2m_client_objects.h
+++ b/pkg/wakaama/include/lwm2m_client_objects.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup         lwm2m_client
  * @{
@@ -16,9 +18,6 @@
  * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
  */
 
-#ifndef LWM2M_CLIENT_OBJECTS_H
-#define LWM2M_CLIENT_OBJECTS_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -68,5 +67,4 @@ lwm2m_object_t *lwm2m_client_get_acc_ctrl_object(
 }
 #endif
 
-#endif /* LWM2M_CLIENT_OBJECTS_H */
 /** @} */
diff --git a/pkg/wakaama/include/lwm2m_platform.h b/pkg/wakaama/include/lwm2m_platform.h
index 21ad1f5fd6db..79be57565ffb 100644
--- a/pkg/wakaama/include/lwm2m_platform.h
+++ b/pkg/wakaama/include/lwm2m_platform.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_wakaama
  * @defgroup    lwm2m_platform Platform adaption for Wakaama package
@@ -16,8 +18,6 @@
  *
  * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
  */
-#ifndef LWM2M_PLATFORM_H
-#define LWM2M_PLATFORM_H
 
 #ifdef __cplusplus
 extern "C" {
@@ -50,5 +50,4 @@ void lwm2m_tlsf_status(void);
 }
 #endif
 
-#endif /* LWM2M_PLATFORM_H */
 /** @} */
diff --git a/pkg/wakaama/include/objects/barometer.h b/pkg/wakaama/include/objects/barometer.h
index e97148c57f44..3728f5731a64 100644
--- a/pkg/wakaama/include/objects/barometer.h
+++ b/pkg/wakaama/include/objects/barometer.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     lwm2m_objects
  * @defgroup    lwm2m_objects_barometer Barometer
@@ -88,9 +90,6 @@
  * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
  */
 
-#ifndef OBJECTS_BAROMETER_H
-#define OBJECTS_BAROMETER_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -157,5 +156,4 @@ void lwm2m_object_barometer_update_value(const lwm2m_client_data_t *client_data,
 }
 #endif
 
-#endif /* OBJECTS_BAROMETER_H */
 /** @} */
diff --git a/pkg/wakaama/include/objects/common.h b/pkg/wakaama/include/objects/common.h
index 4f9df2186d73..ea6b520879fa 100644
--- a/pkg/wakaama/include/objects/common.h
+++ b/pkg/wakaama/include/objects/common.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     pkg_wakaama
  * @defgroup    lwm2m_objects_common Common LwM2M Object functionalities
@@ -17,9 +19,6 @@
  * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
  */
 
-#ifndef OBJECTS_COMMON_H
-#define OBJECTS_COMMON_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -511,5 +510,4 @@ int lwm2m_set_objlink_by_path(lwm2m_client_data_t *client_data, const char *path
 }
 #endif
 
-#endif /* OBJECTS_COMMON_H */
 /** @} */
diff --git a/pkg/wakaama/include/objects/current.h b/pkg/wakaama/include/objects/current.h
index 797adf18ed85..1d4d26158cc7 100644
--- a/pkg/wakaama/include/objects/current.h
+++ b/pkg/wakaama/include/objects/current.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     lwm2m_objects
  * @defgroup    lwm2m_objects_current Current
@@ -86,9 +88,6 @@
  * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
  */
 
-#ifndef OBJECTS_CURRENT_H
-#define OBJECTS_CURRENT_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -155,5 +154,4 @@ void lwm2m_object_current_update_value(const lwm2m_client_data_t *client_data,
 }
 #endif
 
-#endif /* OBJECTS_CURRENT_H */
 /** @} */
diff --git a/pkg/wakaama/include/objects/device.h b/pkg/wakaama/include/objects/device.h
index 5cf1bb06259c..2901b54c7214 100644
--- a/pkg/wakaama/include/objects/device.h
+++ b/pkg/wakaama/include/objects/device.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     lwm2m_objects
  * @defgroup    lwm2m_objects_device Device LwM2M object
@@ -44,9 +46,6 @@
  * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
  */
 
-#ifndef OBJECTS_DEVICE_H
-#define OBJECTS_DEVICE_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -270,5 +269,4 @@ bool lwm2m_device_reboot_requested(void);
 }
 #endif
 
-#endif /* OBJECTS_DEVICE_H */
 /** @} */
diff --git a/pkg/wakaama/include/objects/humidity.h b/pkg/wakaama/include/objects/humidity.h
index eb984f1f0e09..e01137a7d4e8 100644
--- a/pkg/wakaama/include/objects/humidity.h
+++ b/pkg/wakaama/include/objects/humidity.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     lwm2m_objects
  * @defgroup    lwm2m_objects_humidity Humidity
@@ -89,9 +91,6 @@
  * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
  */
 
-#ifndef OBJECTS_HUMIDITY_H
-#define OBJECTS_HUMIDITY_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -158,5 +157,4 @@ void lwm2m_object_humidity_update_value(const lwm2m_client_data_t *client_data,
 }
 #endif
 
-#endif /* OBJECTS_HUMIDITY_H */
 /** @} */
diff --git a/pkg/wakaama/include/objects/illuminance.h b/pkg/wakaama/include/objects/illuminance.h
index 665ed16b1481..f749b97b7c0f 100644
--- a/pkg/wakaama/include/objects/illuminance.h
+++ b/pkg/wakaama/include/objects/illuminance.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     lwm2m_objects
  * @defgroup    lwm2m_objects_illuminance Illuminance
@@ -85,9 +87,6 @@
  * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
  */
 
-#ifndef OBJECTS_ILLUMINANCE_H
-#define OBJECTS_ILLUMINANCE_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -154,5 +153,4 @@ void lwm2m_object_illuminance_update_value(const lwm2m_client_data_t *client_dat
 }
 #endif
 
-#endif /* OBJECTS_ILLUMINANCE_H */
 /** @} */
diff --git a/pkg/wakaama/include/objects/ipso_sensor_base.h b/pkg/wakaama/include/objects/ipso_sensor_base.h
index 2d4f233de0ef..211904ef8695 100644
--- a/pkg/wakaama/include/objects/ipso_sensor_base.h
+++ b/pkg/wakaama/include/objects/ipso_sensor_base.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     lwm2m_objects
  * @defgroup    lwm2m_objects_ipso_sensor_base IPSO Sensor base object
@@ -40,9 +42,6 @@
  * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
  */
 
-#ifndef OBJECTS_IPSO_SENSOR_BASE_H
-#define OBJECTS_IPSO_SENSOR_BASE_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -198,5 +197,4 @@ void lwm2m_object_ipso_sensor_base_update_value(const lwm2m_client_data_t *clien
 }
 #endif
 
-#endif /* OBJECTS_IPSO_SENSOR_BASE_H */
 /** @} */
diff --git a/pkg/wakaama/include/objects/light_control.h b/pkg/wakaama/include/objects/light_control.h
index 924f92e0bb37..768777837385 100644
--- a/pkg/wakaama/include/objects/light_control.h
+++ b/pkg/wakaama/include/objects/light_control.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     lwm2m_objects
  * @defgroup    lwm2m_objects_light_control Light Control
@@ -105,9 +107,6 @@
  * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
  */
 
-#ifndef OBJECTS_LIGHT_CONTROL_H
-#define OBJECTS_LIGHT_CONTROL_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -298,5 +297,4 @@ int lwm2m_object_light_control_update_app_type(uint16_t instance_id, const char
 }
 #endif
 
-#endif /* OBJECTS_LIGHT_CONTROL_H */
 /** @} */
diff --git a/pkg/wakaama/include/objects/on_off_switch.h b/pkg/wakaama/include/objects/on_off_switch.h
index 616715886b5f..8ef9a2fbe517 100644
--- a/pkg/wakaama/include/objects/on_off_switch.h
+++ b/pkg/wakaama/include/objects/on_off_switch.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     lwm2m_objects
  * @defgroup    lwm2m_objects_on_off-switch On/Off Switch
@@ -78,9 +80,6 @@
  * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
  */
 
-#ifndef OBJECTS_ON_OFF_SWITCH_H
-#define OBJECTS_ON_OFF_SWITCH_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -200,5 +199,4 @@ int lwm2m_object_on_off_switch_update_app_type(uint16_t instance_id, const char
 }
 #endif
 
-#endif /* OBJECTS_ON_OFF_SWITCH_H */
 /** @} */
diff --git a/pkg/wakaama/include/objects/security.h b/pkg/wakaama/include/objects/security.h
index 0ae70e2651da..03339a4ba95f 100644
--- a/pkg/wakaama/include/objects/security.h
+++ b/pkg/wakaama/include/objects/security.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     lwm2m_objects
  * @defgroup    lwm2m_objects_security Security LwM2M object
@@ -155,9 +157,6 @@
  * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
  */
 
-#ifndef OBJECTS_SECURITY_H
-#define OBJECTS_SECURITY_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -429,5 +428,4 @@ credman_tag_t lwm2m_object_security_get_credential(uint16_t instance_id);
 }
 #endif
 
-#endif /* OBJECTS_SECURITY_H */
 /** @} */
diff --git a/pkg/wakaama/include/objects/temperature.h b/pkg/wakaama/include/objects/temperature.h
index 938cf726e5f9..2c7d6b276070 100644
--- a/pkg/wakaama/include/objects/temperature.h
+++ b/pkg/wakaama/include/objects/temperature.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     lwm2m_objects
  * @defgroup    lwm2m_objects_temperature Temperature
@@ -88,9 +90,6 @@
  * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
  */
 
-#ifndef OBJECTS_TEMPERATURE_H
-#define OBJECTS_TEMPERATURE_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -157,5 +156,4 @@ void lwm2m_object_temperature_update_value(const lwm2m_client_data_t *client_dat
 }
 #endif
 
-#endif /* OBJECTS_TEMPERATURE_H */
 /** @} */
diff --git a/pkg/wakaama/include/objects/voltage.h b/pkg/wakaama/include/objects/voltage.h
index a5293c348693..96026b7287f2 100644
--- a/pkg/wakaama/include/objects/voltage.h
+++ b/pkg/wakaama/include/objects/voltage.h
@@ -6,6 +6,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /**
  * @ingroup     lwm2m_objects
  * @defgroup    lwm2m_objects_voltage Voltage
@@ -90,9 +92,6 @@
  * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
  */
 
-#ifndef OBJECTS_VOLTAGE_H
-#define OBJECTS_VOLTAGE_H
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -159,5 +158,4 @@ void lwm2m_object_voltage_update_value(const lwm2m_client_data_t *client_data,
 }
 #endif
 
-#endif /* OBJECTS_VOLTAGE_H */
 /** @} */
diff --git a/pkg/wolfssl/include/user_settings.h b/pkg/wolfssl/include/user_settings.h
index aabf30a000ae..d11ff81c3ce9 100644
--- a/pkg/wolfssl/include/user_settings.h
+++ b/pkg/wolfssl/include/user_settings.h
@@ -1,7 +1,6 @@
-/* user_settings.h : custom configuration for wolfcrypt/wolfSSL */
+#pragma once
 
-#ifndef USER_SETTINGS_H
-#define USER_SETTINGS_H
+/* user_settings.h : custom configuration for wolfcrypt/wolfSSL */
 
 #ifdef __cplusplus
 extern "C" {
@@ -340,5 +339,3 @@ int strncasecmp(const char *s1, const char * s2, size_t sz);
 #define _SAME51_AES_COMPONENT_
 #define _SAME54_AES_COMPONENT_
 #define _SAMR34_AES_COMPONENT_
-
-#endif /* USER_SETTINGS_H */
diff --git a/pkg/wolfssl/sock_tls/sock_tls.h b/pkg/wolfssl/sock_tls/sock_tls.h
index e1c5b9a5cfb0..293d4b32bad0 100644
--- a/pkg/wolfssl/sock_tls/sock_tls.h
+++ b/pkg/wolfssl/sock_tls/sock_tls.h
@@ -7,6 +7,8 @@
  * directory for more details.
  */
 
+#pragma once
+
 /* @defgroup    module sock_tls
  * @ingroup     pkg_wolfssl
  * @brief       Sock submodule for TLS/DTLS sessions
@@ -227,8 +229,6 @@
 #include <net/sock.h>
 #include <wolfssl/ssl.h>
 
-#ifndef SOCK_TLS_H
-#define SOCK_TLS_H
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -337,5 +337,3 @@ void sock_dtls_close(sock_tls_t *sk);
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* SOCK_TLS_H */