diff --git a/backend/src/middleware/isAuth.ts b/backend/src/middleware/isAuth.ts
index ae70f05..83cae2a 100644
--- a/backend/src/middleware/isAuth.ts
+++ b/backend/src/middleware/isAuth.ts
@@ -16,7 +16,7 @@ const isAuth = (req: Request, res: Response, next: NextFunction): void => {
   const authHeader = req.headers.authorization;
 
   if (!authHeader) {
-    throw new AppError("Token was not provided.", 403);
+    throw new AppError("ERR_SESSION_EXPIRED", 401);
   }
 
   const [, token] = authHeader.split(" ");