diff --git a/components/dependency_injection/compilation.rst b/components/dependency_injection/compilation.rst
index 30190cd4324..3f9812eb885 100644
--- a/components/dependency_injection/compilation.rst
+++ b/components/dependency_injection/compilation.rst
@@ -292,7 +292,7 @@ method is called by implementing
     {
         // ...
 
-        public function prepend()
+        public function prepend(ContainerBuilder $container)
         {
             // ...