diff --git a/lms/djangoapps/discussion/views.py b/lms/djangoapps/discussion/views.py
index 7bf2274b437f..e50e133fc1ad 100644
--- a/lms/djangoapps/discussion/views.py
+++ b/lms/djangoapps/discussion/views.py
@@ -147,7 +147,7 @@ def get_threads(request, course, user_info, discussion_id=None, per_page=THREADS
         # If the user clicked a sort key, update their default sort key
         cc_user = cc.User.from_django_user(request.user)
         cc_user.default_sort_key = request.GET.get('sort_key')
-        cc_user.save(params={"course_id": course.id})
+        cc_user.save(params={"course_id": str(course.id)})
 
     #there are 2 dimensions to consider when executing a search with respect to group id
     #is user a moderator