diff --git a/book/http_cache.rst b/book/http_cache.rst
index 1d5cb32132d..5cb66842ff5 100644
--- a/book/http_cache.rst
+++ b/book/http_cache.rst
@@ -912,7 +912,7 @@ Here is how you can configure the Symfony reverse proxy to support the
             if ('127.0.0.1' !== $request->getClientIp()) {
                 return new Response(
                     'Invalid HTTP method',
-                    Response::HTTP_BAD_REQUEST
+                    400
                 );
             }