diff --git a/services/core/java/com/android/server/SystemService.java b/services/core/java/com/android/server/SystemService.java
index e3c7325..aabe98b 100644
--- a/services/core/java/com/android/server/SystemService.java
+++ b/services/core/java/com/android/server/SystemService.java
@@ -168,6 +168,11 @@
         public int getUserIdentifier() {
             return mUserInfo.id;
         }
+
+        @Override
+        public String toString() {
+            return Integer.toString(getUserIdentifier());
+        }
     }
 
     /**