diff --git a/service_container/factories.rst b/service_container/factories.rst
index cfca74e26df..39c2f978f5f 100644
--- a/service_container/factories.rst
+++ b/service_container/factories.rst
@@ -105,7 +105,7 @@ Configuration of the service container then looks like this:
 
             App\Email\NewsletterManager:
                 # call a method on the specified factory service
-                factory: 'App\Email\NewsletterManagerFactory:createNewsletterManager'
+                factory: 'App\Email\NewsletterManagerFactory::createNewsletterManager'
 
     .. code-block:: xml
 
@@ -154,7 +154,7 @@ Configuration of the service container then looks like this:
         # config/services.yaml
         App\Email\NewsletterManager:
             # new syntax
-            factory: 'App\Email\NewsletterManagerFactory:createNewsletterManager'
+            factory: 'App\Email\NewsletterManagerFactory::createNewsletterManager'
             # old syntax
             factory: ['@App\Email\NewsletterManagerFactory', createNewsletterManager]