diff --git a/services/core/java/com/android/server/net/NetworkStatsObservers.java b/services/core/java/com/android/server/net/NetworkStatsObservers.java
index 6f781b3ebb..77292846be 100644
--- a/services/core/java/com/android/server/net/NetworkStatsObservers.java
+++ b/services/core/java/com/android/server/net/NetworkStatsObservers.java
@@ -68,7 +68,7 @@ class NetworkStatsObservers {
     private final AtomicInteger mNextDataUsageRequestId = new AtomicInteger();
 
     // Lazily instantiated when an observer is registered.
-    private Handler mHandler;
+    private volatile Handler mHandler;
 
     /**
      * Creates a wrapper that contains the caller context and a normalized request.