diff --git a/HttpServer/Route/CoreMiddleware.php b/HttpServer/Route/CoreMiddleware.php
index 5a3ccc66..3d7d9782 100644
--- a/HttpServer/Route/CoreMiddleware.php
+++ b/HttpServer/Route/CoreMiddleware.php
@@ -25,7 +25,7 @@ class CoreMiddleware implements \HttpServer\IInterface\Middleware
 	 * @return mixed
 	 * @throws Exception
 	 */
-	public function handler(Request $request, Closure $next)
+	public function onHandler(Request $request, Closure $next): mixed
 	{
 		$headers = $request->headers;