diff --git a/angular2-websocket.ts b/angular2-websocket.ts
index 412a2f6..43a6db7 100644
--- a/angular2-websocket.ts
+++ b/angular2-websocket.ts
@@ -152,7 +152,7 @@ export class $WebSocket  {
         var currentCallback;
         for (var i = 0; i < self.onMessageCallbacks.length; i++) {
             currentCallback = self.onMessageCallbacks[i];
-            currentCallback.fn.apply(self, message);
+            currentCallback.fn.apply(self, [message]);
         }
 
     };