diff --git a/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php b/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
index 987102837511a..a33176830e307 100644
--- a/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
+++ b/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
@@ -157,6 +157,9 @@ protected function instantiateObject(array &$data, $class, array &$context, \Ref
         return parent::instantiateObject($data, $class, $context, $reflectionClass, $allowedAttributes, $format);
     }
 
+    /**
+     * @internal
+     */
     protected function parseConstructorParameter(array &$data, $key, array &$context, \ReflectionParameter $constructorParameter, $format)
     {
         if (false === $constructorParameter->hasType() || true === $constructorParameter->getType()->isBuiltin()) {