diff --git a/backend/backend/settings.py b/backend/backend/settings.py
index f1a76eae..b6429b2e 100644
--- a/backend/backend/settings.py
+++ b/backend/backend/settings.py
@@ -125,6 +125,6 @@
 
 
 # we whitelist localhost:3000 because that's where frontend will be served
-CORS_ORIGIN_WHITELIST = (
-     'localhost:3000/'
- )
+CORS_ORIGIN_WHITELIST = [
+     'http://localhost:3000'
+]