diff --git a/openedx/core/djangoapps/content/course_overviews/models.py b/openedx/core/djangoapps/content/course_overviews/models.py
index 2ffe4c1e34..c5b1a8ec58 100644
--- a/openedx/core/djangoapps/content/course_overviews/models.py
+++ b/openedx/core/djangoapps/content/course_overviews/models.py
@@ -725,7 +725,7 @@ class CourseOverview(TimeStampedModel):
         if netloc:
             return url
 
-        return urlunparse((None, base_url, path, params, query, fragment))
+        return urlunparse(('', base_url, path, params, query, fragment))
 
     def __str__(self):
         """Represent ourselves with the course key."""