diff --git a/services/core/java/com/android/server/pm/UserManagerService.java b/services/core/java/com/android/server/pm/UserManagerService.java
index 627fa54..b9fcf4e 100644
--- a/services/core/java/com/android/server/pm/UserManagerService.java
+++ b/services/core/java/com/android/server/pm/UserManagerService.java
@@ -94,6 +94,7 @@
 import com.android.internal.util.XmlUtils;
 import com.android.internal.widget.LockPatternUtils;
 import com.android.server.LocalServices;
+import com.android.server.LockGuard;
 import com.android.server.SystemService;
 import com.android.server.am.UserState;
 import com.android.server.storage.DeviceStorageMonitorInternal;
@@ -227,7 +228,7 @@
     private final Object mPackagesLock;
     private final UserDataPreparer mUserDataPreparer;
     // Short-term lock for internal state, when interaction/sync with PM is not required
-    private final Object mUsersLock = new Object();
+    private final Object mUsersLock = LockGuard.installNewLock(LockGuard.INDEX_USER);
     private final Object mRestrictionsLock = new Object();
 
     private final Handler mHandler;