diff --git a/src/Symfony/Component/Form/Extension/Validator/EventListener/ValidationListener.php b/src/Symfony/Component/Form/Extension/Validator/EventListener/ValidationListener.php
index c760344cfc..1f279faa44 100644
--- a/src/Symfony/Component/Form/Extension/Validator/EventListener/ValidationListener.php
+++ b/src/Symfony/Component/Form/Extension/Validator/EventListener/ValidationListener.php
@@ -46,7 +46,7 @@ class ValidationListener implements EventSubscriberInterface
             throw new \InvalidArgumentException('Validator must be instance of Symfony\Component\Validator\Validator\ValidatorInterface or Symfony\Component\Validator\ValidatorInterface');
         }
 
-        if ($validator instanceof LegacyValidatorInterface) {
+        if (!$validator instanceof ValidatorInterface) {
             @trigger_error('Passing an instance of Symfony\Component\Validator\ValidatorInterface as argument to the '.__METHOD__.' method is deprecated since version 2.8 and will be removed in 3.0. Use an implementation of Symfony\Component\Validator\Validator\ValidatorInterface instead', E_USER_DEPRECATED);
         }