diff --git a/src/Symfony/Component/Security/Http/Authentication/AuthenticationSuccessHandlerInterface.php b/src/Symfony/Component/Security/Http/Authentication/AuthenticationSuccessHandlerInterface.php
index 690234e710ba6..e440b36dd0920 100644
--- a/src/Symfony/Component/Security/Http/Authentication/AuthenticationSuccessHandlerInterface.php
+++ b/src/Symfony/Component/Security/Http/Authentication/AuthenticationSuccessHandlerInterface.php
@@ -29,5 +29,5 @@ interface AuthenticationSuccessHandlerInterface
     /**
      * Usually called by AuthenticatorInterface::onAuthenticationSuccess() implementations.
      */
-    public function onAuthenticationSuccess(Request $request, TokenInterface $token): Response;
+    public function onAuthenticationSuccess(Request $request, TokenInterface $token): ?Response;
 }