diff --git a/backend/app/models/calendar.py b/backend/app/models/calendar.py
index 05c000a..fefb946 100644
--- a/backend/app/models/calendar.py
+++ b/backend/app/models/calendar.py
@@ -21,7 +21,7 @@ class Calendar(db.Model):
                              cascade='all, delete-orphan')
     shares = db.relationship('CalendarShare', backref='calendar', lazy='dynamic',
                              cascade='all, delete-orphan')
-    owner = db.relationship('User', foreign_keys=[owner_id])
+    # Note: `owner` is auto-created as a backref by User.calendars relationship
 
     def to_dict(self):
         return {