diff --git a/backend/express/src/middleware/Authentication.ts b/backend/express/src/middleware/Authentication.ts
index e5028dc..b4b6beb 100644
--- a/backend/express/src/middleware/Authentication.ts
+++ b/backend/express/src/middleware/Authentication.ts
@@ -70,6 +70,7 @@ const fetchUserInfo = async (userinfoEndpoint: string, token: string): Promise<U
         return null;
     }
 
-    response.data.prefferedUsername = response.data.preferred_username;
+    // map to camelCase
+    response.data.preferredUsername = response.data.preferred_username;
     return response.data as User;
 };
\ No newline at end of file