diff --git a/src/Symfony/Component/Validator/Tests/ValidatorBuilderTest.php b/src/Symfony/Component/Validator/Tests/ValidatorBuilderTest.php
index a76a363547564..c1fbc785aecdc 100644
--- a/src/Symfony/Component/Validator/Tests/ValidatorBuilderTest.php
+++ b/src/Symfony/Component/Validator/Tests/ValidatorBuilderTest.php
@@ -102,7 +102,7 @@ public function testSetConstraintValidatorFactory()
     public function testSetTranslator()
     {
         $this->assertSame($this->builder, $this->builder->setTranslator(
-            $this->getMockBuilder('Symfony\Component\Translation\TranslatorInterface')->getMock())
+            $this->getMockBuilder('Symfony\Contracts\Translation\TranslatorInterface')->getMock())
         );
     }
 
diff --git a/src/Symfony/Component/Validator/ValidatorBuilder.php b/src/Symfony/Component/Validator/ValidatorBuilder.php
index fb643327125d5..5c7722c15ff2e 100644
--- a/src/Symfony/Component/Validator/ValidatorBuilder.php
+++ b/src/Symfony/Component/Validator/ValidatorBuilder.php
@@ -256,8 +256,11 @@ public function setConstraintValidatorFactory(ConstraintValidatorFactoryInterfac
     /**
      * {@inheritdoc}
      */
-    public function setTranslator(LegacyTranslatorInterface $translator)
+    public function setTranslator($translator)
     {
+        if (!$translator instanceof LegacyTranslatorInterface && !$translator instanceof TranslatorInterface) {
+            throw new \TypeError(sprintf('Argument 1 passed to %s() must be an instance of %s, %s given.', __METHOD__, TranslatorInterface::class, \is_object($translator) ? \get_class($translator) : \gettype($translator)));
+        }
         $this->translator = $translator instanceof LegacyTranslatorProxy ? $translator->getTranslator() : $translator;
 
         return $this;
diff --git a/src/Symfony/Component/Validator/ValidatorBuilderInterface.php b/src/Symfony/Component/Validator/ValidatorBuilderInterface.php
index 1c764d17963d0..463bcb5f97971 100644
--- a/src/Symfony/Component/Validator/ValidatorBuilderInterface.php
+++ b/src/Symfony/Component/Validator/ValidatorBuilderInterface.php
@@ -12,10 +12,11 @@
 namespace Symfony\Component\Validator;
 
 use Doctrine\Common\Annotations\Reader;
-use Symfony\Component\Translation\TranslatorInterface;
+use Symfony\Component\Translation\TranslatorInterface as LegacyTranslatorInterface;
 use Symfony\Component\Validator\Mapping\Cache\CacheInterface;
 use Symfony\Component\Validator\Mapping\Factory\MetadataFactoryInterface;
 use Symfony\Component\Validator\Validator\ValidatorInterface;
+use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
  * A configurable builder for ValidatorInterface objects.
@@ -134,9 +135,11 @@ public function setConstraintValidatorFactory(ConstraintValidatorFactoryInterfac
     /**
      * Sets the translator used for translating violation messages.
      *
+     * @param TranslatorInterface|LegacyTranslatorInterface $translator
+     *
      * @return $this
      */
-    public function setTranslator(TranslatorInterface $translator);
+    public function setTranslator($translator);
 
     /**
      * Sets the default translation domain of violation messages.