diff --git a/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php b/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
index 2cf9ca8c0d074..4996848143b73 100644
--- a/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
+++ b/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bridge\Doctrine\Validator\Constraints;
 
-use Doctrine\ORM\EntityManagerInterface;
-use Doctrine\ORM\Mapping\ClassMetadata;
 use Doctrine\Persistence\ManagerRegistry;
+use Doctrine\Persistence\Mapping\ClassMetadata;
+use Doctrine\Persistence\ObjectManager;
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\ConstraintValidator;
 use Symfony\Component\Validator\Exception\ConstraintDefinitionException;
@@ -177,7 +177,7 @@ public function validate($entity, Constraint $constraint)
             ->addViolation();
     }
 
-    private function formatWithIdentifiers(EntityManagerInterface $em, ClassMetadata $class, $value)
+    private function formatWithIdentifiers(ObjectManager $em, ClassMetadata $class, $value)
     {
         if (!\is_object($value) || $value instanceof \DateTimeInterface) {
             return $this->formatValue($value, self::PRETTY_DATE);