diff --git a/src/Http/MiddlewareStack.php b/src/Http/MiddlewareStack.php
index 7777bad..3c5cb66 100644
--- a/src/Http/MiddlewareStack.php
+++ b/src/Http/MiddlewareStack.php
@@ -13,7 +13,7 @@
 /**
  * @internal
  */
-final class MiddlewareStack
+final class MiddlewareStack implements RequestHandlerInterface
 {
     public function __construct(
         private RequestHandlerInterface $kernelHandler,