diff --git a/src/camera.js b/src/camera.js
index 5403b3ca..5b394e2e 100644
--- a/src/camera.js
+++ b/src/camera.js
@@ -21,15 +21,12 @@ class Camera {
     let constraints = {
       audio: false,
       video: {
-        mandatory: {
-          sourceId: this.id,
-          minWidth: 600,
-          maxWidth: 800,
-          minAspectRatio: 1.6
-        },
-        optional: []
+        deviceId: this.id ? { exact: this.id } : undefined,
+        facingMode: { ideal: "environment" },
+        width: { min: 600, max: 800 },
+        aspectRatio: { min: 1.6 }
       }
-    };
+    };    
 
     this._stream = await Camera._wrapErrors(async () => {
       return await navigator.mediaDevices.getUserMedia(constraints);