diff --git a/service_container/parameters.rst b/service_container/parameters.rst
index 5ad946090cf..1d6e95e48de 100644
--- a/service_container/parameters.rst
+++ b/service_container/parameters.rst
@@ -260,8 +260,8 @@ Setting PHP constants as parameters is also supported:
 
         # config/services.yaml
         parameters:
-            global.constant.value: !php/const:GLOBAL_CONSTANT
-            my_class.constant.value: !php/const:My_Class::CONSTANT_NAME
+            global.constant.value: !php/const GLOBAL_CONSTANT
+            my_class.constant.value: !php/const My_Class::CONSTANT_NAME
 
     .. code-block:: xml