diff --git a/src/assets/js/rtcClient.js b/src/assets/js/rtcClient.js
index 7b54b3f..b9fcb46 100644
--- a/src/assets/js/rtcClient.js
+++ b/src/assets/js/rtcClient.js
@@ -224,7 +224,7 @@ class RtcClient{
     
     getDynamicKey(channelName){
         // if dynamic not enabled
-        return new Deferred().resolve(undefined).promise();
+        return new $.Deferred().resolve(undefined).promise();
         
         // if dynamic key enabled
         // return $.ajax({