diff --git a/best_practices/business-logic.rst b/best_practices/business-logic.rst
index 9ddb6c5aa00..b15903be992 100644
--- a/best_practices/business-logic.rst
+++ b/best_practices/business-logic.rst
@@ -140,9 +140,12 @@ the class namespace as a parameter:
     # app/config/services.yml
 
     # service definition with class namespace as parameter
+    parameters:
+        slugger.class: AppBundle\Utils\Slugger
+
     services:
         app.slugger:
-            class: AppBundle\Utils\Slugger
+            class: "%slugger.class%"
 
 This practice is cumbersome and completely unnecessary for your own services: