diff --git a/docs/cookbook/recipe_sonata_admin_without_user_bundle.rst b/docs/cookbook/recipe_sonata_admin_without_user_bundle.rst
index 4ab51d9c45..fe1d7e77fe 100644
--- a/docs/cookbook/recipe_sonata_admin_without_user_bundle.rst
+++ b/docs/cookbook/recipe_sonata_admin_without_user_bundle.rst
@@ -241,9 +241,9 @@ more about it `here <https://symfony.com/doc/4.4/security/guard_authentication.h
             return new RedirectResponse($this->router->generate('admin_login'));
         }
 
-        protected function getLoginUrl(): RedirectResponse
+        protected function getLoginUrl(): string
         {
-            return new RedirectResponse($this->router->generate('admin_login'));
+            return $this->router->generate('admin_login');
         }
 
         public function onAuthenticationSuccess(Request $request, TokenInterface $token, $providerKey): RedirectResponse