diff --git a/internal/proxy/fuse.go b/internal/proxy/fuse.go
index 748b8400b..da9694fc8 100644
--- a/internal/proxy/fuse.go
+++ b/internal/proxy/fuse.go
@@ -13,7 +13,6 @@
 // limitations under the License.
 
 //go:build !windows && !openbsd && !freebsd
-// +build !windows,!openbsd,!freebsd
 
 package proxy
 
diff --git a/internal/proxy/fuse_test.go b/internal/proxy/fuse_test.go
index 0379c9072..02face315 100644
--- a/internal/proxy/fuse_test.go
+++ b/internal/proxy/fuse_test.go
@@ -13,7 +13,6 @@
 // limitations under the License.
 
 //go:build !windows && !darwin
-// +build !windows,!darwin
 
 package proxy_test
 
diff --git a/internal/proxy/proxy.go b/internal/proxy/proxy.go
index ac4aae83b..69ec48551 100644
--- a/internal/proxy/proxy.go
+++ b/internal/proxy/proxy.go
@@ -297,6 +297,11 @@ func dialOptions(c Config, i InstanceConnConfig) []cloudsqlconn.DialOption {
 	default:
 		// assume public IP by default
 	}
+	if networkType(&c, i) == "unix" {
+		opts = append(opts, cloudsqlconn.WithMdxClientProtocolType("uds"))
+	} else {
+		opts = append(opts, cloudsqlconn.WithMdxClientProtocolType("tcp"))
+	}
 
 	return opts
 }
diff --git a/internal/proxy/proxy_other.go b/internal/proxy/proxy_other.go
index f6199167b..b3c7180f3 100644
--- a/internal/proxy/proxy_other.go
+++ b/internal/proxy/proxy_other.go
@@ -13,7 +13,6 @@
 // limitations under the License.
 
 //go:build !windows && !openbsd && !freebsd
-// +build !windows,!openbsd,!freebsd
 
 package proxy
 
diff --git a/internal/proxy/proxy_other_test.go b/internal/proxy/proxy_other_test.go
index b3503848a..77d7c21bb 100644
--- a/internal/proxy/proxy_other_test.go
+++ b/internal/proxy/proxy_other_test.go
@@ -13,7 +13,6 @@
 // limitations under the License.
 
 //go:build !windows
-// +build !windows
 
 package proxy_test
 
diff --git a/internal/proxy/unix.go b/internal/proxy/unix.go
index 523c49451..7ecd59517 100644
--- a/internal/proxy/unix.go
+++ b/internal/proxy/unix.go
@@ -13,7 +13,6 @@
 // limitations under the License.
 
 //go:build !windows
-// +build !windows
 
 package proxy
 
diff --git a/main.go b/main.go
index d9188054f..4a73ee881 100644
--- a/main.go
+++ b/main.go
@@ -13,7 +13,6 @@
 // limitations under the License.
 
 //go:build !windows
-// +build !windows
 
 package main