diff --git a/Python/Flask_Blog/10-Password-Reset-Email/flaskblog/models.py b/Python/Flask_Blog/10-Password-Reset-Email/flaskblog/models.py
index 1cee294b8..39c226f8e 100644
--- a/Python/Flask_Blog/10-Password-Reset-Email/flaskblog/models.py
+++ b/Python/Flask_Blog/10-Password-Reset-Email/flaskblog/models.py
@@ -18,7 +18,7 @@ class User(db.Model, UserMixin):
     posts = db.relationship('Post', backref='author', lazy=True)
 
     def get_reset_token(self, expires_sec=1800):
-        s = Serializer(app.config['SECRET_KEY'], expires_sec)
+        s = Serializer(app.config['SECRET_KEY'], expires_in = expires_sec)
         return s.dumps({'user_id': self.id}).decode('utf-8')
 
     @staticmethod