diff --git a/backend/express/src/middleware/Authentication.ts b/backend/express/src/middleware/Authentication.ts
index b4f741b..e5028dc 100644
--- a/backend/express/src/middleware/Authentication.ts
+++ b/backend/express/src/middleware/Authentication.ts
@@ -70,5 +70,6 @@ const fetchUserInfo = async (userinfoEndpoint: string, token: string): Promise<U
         return null;
     }
 
+    response.data.prefferedUsername = response.data.preferred_username;
     return response.data as User;
 };
\ No newline at end of file