diff --git a/examples/mongodb-oauth/app/models.py b/examples/mongodb-oauth/app/models.py
index e2392e25..04050f8a 100644
--- a/examples/mongodb-oauth/app/models.py
+++ b/examples/mongodb-oauth/app/models.py
@@ -1,7 +1,7 @@
 from fastapi_users import models
 
 
-class User(models.BaseUser):
+class User(models.BaseUser, models.BaseOAuthAccountMixin):
     pass