diff --git a/services/core/java/com/android/server/stats/StatsCompanionService.java b/services/core/java/com/android/server/stats/StatsCompanionService.java
index c7c24a562696b..217577281bf85 100644
--- a/services/core/java/com/android/server/stats/StatsCompanionService.java
+++ b/services/core/java/com/android/server/stats/StatsCompanionService.java
@@ -1179,6 +1179,7 @@ public class StatsCompanionService extends IStatsCompanionService.Stub {
         }
     }
 
+    @GuardedBy("StatsCompanionService.sStatsdLock")
     private void forgetEverythingLocked() {
         sStatsd = null;
         mContext.unregisterReceiver(mAppUpdateReceiver);