diff --git a/object_mapper.rst b/object_mapper.rst
index 625466ffefc..61bb6055c59 100644
--- a/object_mapper.rst
+++ b/object_mapper.rst
@@ -375,7 +375,7 @@ Then, use this service to format the mapped property::
     class UserInput
     {
         // this property's value will be generated by the transformer
-        #[Map(target: 'fullName', transform: FullNameTransformer::class)]
+        #[Map(target: 'fullName', transform: new FullNameTransformer())]
         public string $firstName = '';
 
         public string $lastName = '';