diff --git a/example/users/models.py b/example/users/models.py
index dc42bed..5ebd69b 100644
--- a/example/users/models.py
+++ b/example/users/models.py
@@ -7,6 +7,7 @@ class User(AbstractBaseUser, PermissionsMixin):
     USERNAME_FIELD = 'email'
     REQUIRED_FIELDS = ['first_name', 'last_name']
 
+    username = models.CharField(max_length=100)
     first_name = models.CharField(max_length=50)
     last_name = models.CharField(max_length=50)
     email = models.EmailField(unique=True)