diff --git a/service_container/3.3-di-changes.rst b/service_container/3.3-di-changes.rst
index 294b255ac85..2ba6a67156f 100644
--- a/service_container/3.3-di-changes.rst
+++ b/service_container/3.3-di-changes.rst
@@ -489,9 +489,9 @@ inherited from an abstract definition:
             # ...
 
             _instanceof:
-                class: AppBundle\Domain\LoaderInterface
-                public: true
-                tags: ['app.domain_loader']
+                AppBundle\Domain\LoaderInterface:
+                    public: true
+                    tags: ['app.domain_loader']
 
     .. code-block:: xml