diff --git a/routing.rst b/routing.rst
index b012a70a260..54576f75ea1 100644
--- a/routing.rst
+++ b/routing.rst
@@ -616,7 +616,7 @@ Troubleshooting
 
 Here are some common errors you might see while working with routing:
 
-    Controller "App\Controller\BlogController::show()" requires that you
+    Controller "App\\Controller\\BlogController::show()" requires that you
     provide a value for the "$slug" argument.
 
 This happens when your controller method has an argument (e.g. ``$slug``)::