diff --git a/lms/djangoapps/discussion/rest_api/api.py b/lms/djangoapps/discussion/rest_api/api.py
index 1b7a9aa870..1683dca114 100644
--- a/lms/djangoapps/discussion/rest_api/api.py
+++ b/lms/djangoapps/discussion/rest_api/api.py
@@ -676,7 +676,7 @@ def get_comment_list(request, thread_id, endorsed, page, page_size, requested_fi
     # behavior and return a PageNotFoundError in that case
     if not responses and page != 1:
         raise PageNotFoundError("Page not found (No results on this page).")
-    num_pages = (resp_total + page_size - 1) / page_size if resp_total else 1
+    num_pages = (resp_total + page_size - 1) // page_size if resp_total else 1
 
     results = _serialize_discussion_entities(request, context, responses, requested_fields, DiscussionEntity.comment)