diff --git a/src/jwtauth/serializers.py b/src/jwtauth/serializers.py
index f07bedb..66410d3 100644
--- a/src/jwtauth/serializers.py
+++ b/src/jwtauth/serializers.py
@@ -28,7 +28,7 @@ class RegistrationSerializer(serializers.ModelSerializer):
             user=user
         )
         return {
-            'username': user.username,
+            'username': user.email,
             'access_token': user.access_token,
             'refresh_token': token.token
         }