diff --git a/greenmine/scrum/models.py b/greenmine/scrum/models.py
index 0bbb4ce5..4f25fbbf 100644
--- a/greenmine/scrum/models.py
+++ b/greenmine/scrum/models.py
@@ -484,7 +484,7 @@ class Attachment(models.Model):
 class Task(models.Model):
     uuid = models.CharField(max_length=40, unique=True, null=False, blank=True,
                 verbose_name=_('uuid'))
-    user_story = models.ForeignKey('UserStory', null=False, blank=False,
+    user_story = models.ForeignKey('UserStory', null=True, blank=False,
                 related_name='tasks',
                 verbose_name=_('user story'))
     ref = models.BigIntegerField(db_index=True, null=True, blank=True, default=None,