diff --git a/dav_events/models.py b/dav_events/models.py
index f58db4e..d7768e8 100644
--- a/dav_events/models.py
+++ b/dav_events/models.py
@@ -147,7 +147,7 @@ class Event(models.Model):
         default_permissions = ('view', 'accept', 'edit', 'delete')
 
     def __unicode__(self):
-        return u'{number} - {title} ({date})'.format(number=self.number,
+        return u'{number} - {title} ({date})'.format(number=self.get_number(),
                                                      title=self.title,
                                                      date=self.get_short_date())