diff --git a/java/src/com/android/inputmethod/dictionarypack/DictionaryService.java b/java/src/com/android/inputmethod/dictionarypack/DictionaryService.java
index fe988ac704..5ab55bc444 100644
--- a/java/src/com/android/inputmethod/dictionarypack/DictionaryService.java
+++ b/java/src/com/android/inputmethod/dictionarypack/DictionaryService.java
@@ -229,8 +229,14 @@ private static void checkTimeAndMaybeSetupUpdateAlarm(final Context context) {
         final long now = System.currentTimeMillis();
         final long alarmTime = now + new Random().nextInt(MAX_ALARM_DELAY_MILLIS);
         final Intent updateIntent = new Intent(DictionaryPackConstants.UPDATE_NOW_INTENT_ACTION);
+        // Set the package name to ensure the PendingIntent is only delivered to trusted components
+        updateIntent.setPackage(context.getPackageName());
+        int pendingIntentFlags = PendingIntent.FLAG_CANCEL_CURRENT;
+        if (android.os.Build.VERSION.SDK_INT >= 23) {
+            pendingIntentFlags |= PendingIntent.FLAG_IMMUTABLE;
+        }
         final PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0,
-                updateIntent, PendingIntent.FLAG_CANCEL_CURRENT);
+                updateIntent, pendingIntentFlags);
 
         // We set the alarm in the type that doesn't forcefully wake the device
         // from sleep, but fires the next time the device actually wakes for any