diff --git a/lib/models.py b/lib/models.py
index 38164d7..5c0337b 100644
--- a/lib/models.py
+++ b/lib/models.py
@@ -114,4 +114,3 @@ class Subject(db.Model):
 
 class Subscription(db.Model):
   client = db.ReferenceProperty(reference_class=Client)
-  subject = db.ReferenceProperty(reference_class=Subject)