diff --git a/openslides/assignment/models.py b/openslides/assignment/models.py
index d92261bc7..f7588f45d 100644
--- a/openslides/assignment/models.py
+++ b/openslides/assignment/models.py
@@ -154,11 +154,11 @@ class Assignment(models.Model, SlideMixin):
 
     def get_absolute_url(self, link='view'):
         if link == 'view':
-            return reverse('assignment_view', args=(str(self.id)))
+            return reverse('assignment_view', args=[str(self.id)])
         if link == 'edit':
-            return reverse('assignment_edit', args=(str(self.id)))
+            return reverse('assignment_edit', args=[str(self.id)])
         if link == 'delete':
-            return reverse('assignment_delete', args=(str(self.id)))
+            return reverse('assignment_delete', args=[str(self.id)])
 
     def __unicode__(self):
         return self.name