diff --git a/services/core/java/com/android/server/audio/AudioService.java b/services/core/java/com/android/server/audio/AudioService.java
index 5e6cf1a..49fa39d 100644
--- a/services/core/java/com/android/server/audio/AudioService.java
+++ b/services/core/java/com/android/server/audio/AudioService.java
@@ -9680,9 +9680,9 @@
             mContentResolver.registerContentObserver(Settings.Global.getUriFor(
                 Settings.Global.DOCK_AUDIO_MEDIA_ENABLED), false, this);
             mContentResolver.registerContentObserver(Settings.System.getUriFor(
-                    Settings.System.MASTER_MONO), false, this);
+                    Settings.System.MASTER_MONO), false, this, UserHandle.USER_ALL);
             mContentResolver.registerContentObserver(Settings.System.getUriFor(
-                    Settings.System.MASTER_BALANCE), false, this);
+                    Settings.System.MASTER_BALANCE), false, this, UserHandle.USER_ALL);
 
             mEncodedSurroundMode = mSettings.getGlobalInt(
                     mContentResolver, Settings.Global.ENCODED_SURROUND_OUTPUT,