diff --git a/src/Symfony/Component/Validator/Mapping/ElementMetadata.php b/src/Symfony/Component/Validator/Mapping/ElementMetadata.php
index 6886a8993d..1783864e00 100644
--- a/src/Symfony/Component/Validator/Mapping/ElementMetadata.php
+++ b/src/Symfony/Component/Validator/Mapping/ElementMetadata.php
@@ -23,7 +23,7 @@ abstract class ElementMetadata extends GenericMetadata
 {
     public function __construct()
     {
-        if (__CLASS__ === get_class($this) || !in_array(get_parent_class($this), array('Symfony\Component\Validator\Mapping\MemberMetadata', 'Symfony\Component\Validator\Mapping\ClassMetadata'))) {
+        if (!$this instanceof MemberMetadata && !$this instanceof ClassMetadata) {
             trigger_error('The '.__CLASS__.' class is deprecated since version 2.5 and will be removed in 3.0. Use the Symfony\Component\Validator\Mapping\GenericMetadata class instead.', E_USER_DEPRECATED);
         }
     }