diff --git a/app/models.py b/app/models.py
index b3d894fd2a..06cbaf7c66 100644
--- a/app/models.py
+++ b/app/models.py
@@ -1365,9 +1365,8 @@ class Notification(db.Model):
 
     postage = db.Column(db.String, nullable=True)
     billing_code = db.Column(db.String(256), nullable=True)
-
     callback_url = db.Column(db.String(255), nullable=True)
-    
+
     CheckConstraint(
         """
         CASE WHEN notification_type = 'letter' THEN