diff --git a/ungleichotpserver/settings.py b/ungleichotpserver/settings.py
index 99cb9bb..72befd5 100644
--- a/ungleichotpserver/settings.py
+++ b/ungleichotpserver/settings.py
@@ -132,7 +132,7 @@ DEBUG_DATABASES = {
 }
 
 DEBUG = config('DEBUG', False, cast=bool)
-ALLOWED_HOSTS = config('ALLOWED_HOSTS', default='localhost', cast=Csv)
+ALLOWED_HOSTS = config('ALLOWED_HOSTS', default='localhost', cast=Csv())
 
 DATABASES = {
     'default': {