diff --git a/celery_progress/backend.py b/celery_progress/backend.py
index <HASH>..<HASH> 100644
--- a/celery_progress/backend.py
+++ b/celery_progress/backend.py
@@ -73,7 +73,7 @@ def _get_completed_progress():
     }
 
 def _get_unknown_progress():
-    {
+    return {
         'current': 0,
         'total': 100,
         'percent': 0,
Added missing return statement. Closing #<I>.