diff --git a/taiga/projects/userstories/signals.py b/taiga/projects/userstories/signals.py
index 11638595..fc1fdacc 100644
--- a/taiga/projects/userstories/signals.py
+++ b/taiga/projects/userstories/signals.py
@@ -59,7 +59,7 @@ def update_role_points_when_create_or_edit_us(sender, instance, **kwargs):
 
 def update_milestone_of_tasks_when_edit_us(sender, instance, created, **kwargs):
     if not created:
-        instance.tasks.update(milestone=instance.milestone)
+        instance.tasks.exclude(milestone=instance.milestone).update(milestone=instance.milestone)
         for task in instance.tasks.all():
             take_snapshot(task)