diff --git a/service_container/expression_language.rst b/service_container/expression_language.rst
index 15fbb780b6e..2e59b804dc2 100644
--- a/service_container/expression_language.rst
+++ b/service_container/expression_language.rst
@@ -28,7 +28,7 @@ to another service: ``AppBundle\Mailer``. One way to do this is with an expressi
             AppBundle\Mail\MailerConfiguration: ~
 
             AppBundle\Mailer:
-                arguments: ["@=service('AppBundle\\Mail\\MailerConfiguration').getMailerMethod()"]
+                arguments: ["@=service('AppBundle\\\\Mail\\\\MailerConfiguration').getMailerMethod()"]
 
     .. code-block:: xml