diff --git a/app/assets/javascripts/meeting.coffee b/app/assets/javascripts/meeting.coffee
index 22ff3c51..f408deb6 100644
--- a/app/assets/javascripts/meeting.coffee
+++ b/app/assets/javascripts/meeting.coffee
@@ -27,7 +27,7 @@ class @Meeting
   @buildFullDomainURL: ->
     url = location.protocol + '//' + location.hostname
     if location.port
-      url.concat ':' + location.port
+      url += ':' + location.port
     return url
 
   # Sends the end meeting request