diff --git a/services/java/com/android/server/net/NetworkStatsService.java b/services/java/com/android/server/net/NetworkStatsService.java
index a9d4b59622..1a56b80d7e 100644
--- a/services/java/com/android/server/net/NetworkStatsService.java
+++ b/services/java/com/android/server/net/NetworkStatsService.java
@@ -616,10 +616,12 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
         // persist if beyond new thresholds
         final long currentTime = mTime.hasCache() ? mTime.currentTimeMillis()
                 : System.currentTimeMillis();
-        mDevRecorder.maybePersistLocked(currentTime);
-        mXtRecorder.maybePersistLocked(currentTime);
-        mUidRecorder.maybePersistLocked(currentTime);
-        mUidTagRecorder.maybePersistLocked(currentTime);
+        synchronized (mStatsLock) {
+            mDevRecorder.maybePersistLocked(currentTime);
+            mXtRecorder.maybePersistLocked(currentTime);
+            mUidRecorder.maybePersistLocked(currentTime);
+            mUidTagRecorder.maybePersistLocked(currentTime);
+        }
 
         // re-arm global alert
         registerGlobalAlert();