diff --git a/pypowerdns/models.py b/pypowerdns/models.py
index 825c9eb..5af3e31 100644
--- a/pypowerdns/models.py
+++ b/pypowerdns/models.py
@@ -94,6 +94,7 @@ class Record(db.Model):
 
 class Supermaster(db.Model):
     __tablename__ = "supermasters"
+    id = db.Column(db.Integer, primary_key=True)
     ip = db.Column(db.String(25))
     nameserver = db.Column(db.String(255))
     account = db.Column(db.String(40))