diff --git a/lms/static/coffee/src/discussion/discussion.coffee b/lms/static/coffee/src/discussion/discussion.coffee
index ecf5ee6f1d..b62770ca8a 100644
--- a/lms/static/coffee/src/discussion/discussion.coffee
+++ b/lms/static/coffee/src/discussion/discussion.coffee
@@ -2,7 +2,7 @@ if Backbone?
   class @Discussion extends Backbone.Collection
     model: Thread
 
-    initialize: (models, options)->
+    initialize: (models, options={})->
       @pages = options['pages'] || 1
       @current_page = 1
       @bind "add", (item) =>