diff --git a/lms/djangoapps/course_api/blocks/toggles.py b/lms/djangoapps/course_api/blocks/toggles.py
index 489bd7dcdd..5b0c82e291 100644
--- a/lms/djangoapps/course_api/blocks/toggles.py
+++ b/lms/djangoapps/course_api/blocks/toggles.py
@@ -41,5 +41,5 @@ HIDE_ACCESS_DENIALS_FLAG = WaffleFlag(
 ENABLE_VIDEO_URL_REWRITE = CourseWaffleFlag(
     waffle_namespace=COURSE_BLOCKS_API_NAMESPACE,
     flag_name="enable_video_url_rewrite",
-    flag_undefined_default=True
+    flag_undefined_default=False
 )