diff --git a/common/djangoapps/course_groups/cohorts.py b/common/djangoapps/course_groups/cohorts.py
index 33b683776c..b7401ef8a2 100644
--- a/common/djangoapps/course_groups/cohorts.py
+++ b/common/djangoapps/course_groups/cohorts.py
@@ -49,7 +49,7 @@ def is_commentable_cohorted(course_id, commentable_id):
 
 def get_cohort(user, course_id):
     c = _get_cohort(user, course_id)
-    log.debug("get_cohort({0}, {1}) = {2}", user, course_id, c.id)
+    log.debug("get_cohort({0}, {1}) = {2}".format(user, course_id, c.id))
 
 def _get_cohort(user, course_id):
     """