diff --git a/cookbook/security/impersonating_user.rst b/cookbook/security/impersonating_user.rst
index 53da2368763..57aa20e329a 100644
--- a/cookbook/security/impersonating_user.rst
+++ b/cookbook/security/impersonating_user.rst
@@ -223,7 +223,7 @@ how to change the sticky locale:
 
 .. code-block:: php
 
-        // src/AppBundle/EventListener/SwitchUserListener.pnp
+        // src/AppBundle/EventListener/SwitchUserListener.php
         namespace AppBundle\EventListener;
 
         use Symfony\Component\Security\Http\Event\SwitchUserEvent;