diff --git a/api/.env.example b/api/.env.example
index ccf54d0..10a3d48 100644
--- a/api/.env.example
+++ b/api/.env.example
@@ -5,4 +5,4 @@ DATABASES_USER=user
 DATABASES_PASS=1234
 
 ## CORS Einstellungen
-CORS_ALLOW_ORIGIN=localhost:*
\ No newline at end of file
+CORS_ALLOW_ORIGIN_REGEX=/https?:\/\/localhost:\d+/
\ No newline at end of file