diff --git a/cms/envs/dev.py b/cms/envs/dev.py
index a0cc3cba39..edfe8fe8eb 100644
--- a/cms/envs/dev.py
+++ b/cms/envs/dev.py
@@ -135,7 +135,7 @@ CELERY_ALWAYS_EAGER = True
 
 ################################ DEBUG TOOLBAR #################################
 INSTALLED_APPS += ('debug_toolbar', 'debug_toolbar_mongo', 'djpyfs')
-MIDDLEWARE_CLASSES += ('debug_toolbar.middleware.DebugToolbarMiddleware')
+MIDDLEWARE_CLASSES += ('debug_toolbar.middleware.DebugToolbarMiddleware',)
 INTERNAL_IPS = ('127.0.0.1',)
 
 DEBUG_TOOLBAR_PANELS = (