diff --git a/taiga/projects/milestones/services.py b/taiga/projects/milestones/services.py
index cac04870..a94be521 100644
--- a/taiga/projects/milestones/services.py
+++ b/taiga/projects/milestones/services.py
@@ -21,7 +21,8 @@ from . import models
 
 
 def calculate_milestone_is_closed(milestone):
-    return (all([task.status.is_closed for task in milestone.tasks.all()]) and
+    return (milestone.user_stories.all().count() > 0 and
+            all([task.status.is_closed for task in milestone.tasks.all()]) and
             all([user_story.is_closed for user_story in milestone.user_stories.all()]))