diff --git a/src/Symfony/Component/HttpClient/Response/AsyncResponse.php b/src/Symfony/Component/HttpClient/Response/AsyncResponse.php
index 66152e3d90c7e..e37278f79f711 100644
--- a/src/Symfony/Component/HttpClient/Response/AsyncResponse.php
+++ b/src/Symfony/Component/HttpClient/Response/AsyncResponse.php
@@ -27,7 +27,7 @@
  *
  * @author Nicolas Grekas <p@tchwork.com>
  */
-final class AsyncResponse implements ResponseInterface, StreamableInterface
+class AsyncResponse implements ResponseInterface, StreamableInterface
 {
     use CommonResponseTrait;