diff --git a/cookbook/debugging.rst b/cookbook/debugging.rst
index 205b2b22192..79eff11c6bf 100644
--- a/cookbook/debugging.rst
+++ b/cookbook/debugging.rst
@@ -46,7 +46,7 @@ below::
     // ...
 
     // require_once __DIR__.'/../app/bootstrap.php.cache';
-    require_once __DIR__.'/../vendor/symfony/src/Symfony/Component/ClassLoader/UniversalClassLoader.php';
+    require_once __DIR__.'/../vendor/symfony/symfony/src/Symfony/Component/ClassLoader/UniversalClassLoader.php';
     require_once __DIR__.'/../app/autoload.php';
     require_once __DIR__.'/../app/AppKernel.php';