diff --git a/Samples/GPSTracker/GPSTracker.GrainImplementation/PushNotifierGrain.cs b/Samples/GPSTracker/GPSTracker.GrainImplementation/PushNotifierGrain.cs
index 87eb973a03..d5c540050c 100644
--- a/Samples/GPSTracker/GPSTracker.GrainImplementation/PushNotifierGrain.cs
+++ b/Samples/GPSTracker/GPSTracker.GrainImplementation/PushNotifierGrain.cs
@@ -104,7 +104,7 @@ public Task SendMessage(VelocityMessage message)
         {
             // add a message to the send queue
             messageQueue.Add(message);
-            if (messageQueue.Count < 25)
+            if (messageQueue.Count > 25)
             {
                 // if the queue size is greater than 25, flush the queue
                 Flush();