diff --git a/src/Symfony/Component/Translation/LoggingTranslator.php b/src/Symfony/Component/Translation/LoggingTranslator.php
index 851188230b..8373ad1b21 100644
--- a/src/Symfony/Component/Translation/LoggingTranslator.php
+++ b/src/Symfony/Component/Translation/LoggingTranslator.php
@@ -19,7 +19,7 @@ use Psr\Log\LoggerInterface;
 class LoggingTranslator implements TranslatorInterface, TranslatorBagInterface
 {
     /**
-     * @var TranslatorInterface
+     * @var TranslatorInterface|TranslatorBagInterface
      */
     private $translator;
 
@@ -29,13 +29,13 @@ class LoggingTranslator implements TranslatorInterface, TranslatorBagInterface
     private $logger;
 
     /**
-     * @param Translator      $translator
-     * @param LoggerInterface $logger
+     * @param TranslatorInterface $translator The translator must implement TranslatorBagInterface
+     * @param LoggerInterface     $logger
      */
-    public function __construct($translator, LoggerInterface $logger)
+    public function __construct(TranslatorInterface $translator, LoggerInterface $logger)
     {
-        if (!($translator instanceof TranslatorInterface && $translator instanceof TranslatorBagInterface)) {
-            throw new \InvalidArgumentException(sprintf('The Translator "%s" must implements TranslatorInterface and TranslatorBagInterface.', get_class($translator)));
+        if (!$translator instanceof TranslatorBagInterface) {
+            throw new \InvalidArgumentException(sprintf('The Translator "%s" must implement TranslatorInterface and TranslatorBagInterface.', get_class($translator)));
         }
 
         $this->translator = $translator;