diff --git a/quickstep/src/com/android/quickstep/RecentsModel.java b/quickstep/src/com/android/quickstep/RecentsModel.java
index d11d50b..1634c08 100644
--- a/quickstep/src/com/android/quickstep/RecentsModel.java
+++ b/quickstep/src/com/android/quickstep/RecentsModel.java
@@ -165,7 +165,7 @@
     }
 
     @Override
-    public void onTaskSnapshotChanged(int taskId, ThumbnailData snapshot) {
+    public boolean onTaskSnapshotChanged(int taskId, ThumbnailData snapshot) {
         mThumbnailCache.updateTaskSnapShot(taskId, snapshot);
 
         for (int i = mThumbnailChangeListeners.size() - 1; i >= 0; i--) {
@@ -174,6 +174,7 @@
                 task.thumbnail = snapshot;
             }
         }
+        return true;
     }
 
     @Override