diff --git a/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php b/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php
index 190bd5d0da..14cb2adecf 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php
@@ -63,7 +63,7 @@ class Translator extends BaseTranslator implements WarmableInterface
      *
      * @throws InvalidArgumentException
      */
-    public function __construct(ContainerInterface $container, $formatter, string $defaultLocale, array $loaderIds = array(), array $options = array())
+    public function __construct(ContainerInterface $container, MessageFormatterInterface $formatter, string $defaultLocale, array $loaderIds = array(), array $options = array())
     {
         $this->container = $container;
         $this->loaderIds = $loaderIds;
diff --git a/src/Symfony/Component/Translation/CHANGELOG.md b/src/Symfony/Component/Translation/CHANGELOG.md
index 289fed1ce4..ed821fa03d 100644
--- a/src/Symfony/Component/Translation/CHANGELOG.md
+++ b/src/Symfony/Component/Translation/CHANGELOG.md
@@ -6,6 +6,7 @@ CHANGELOG
 
  * removed the backup feature of the `FileDumper` class
  * removed `TranslationWriter::writeTranslations()` method
+ * removed support for passing `MessageSelector` instances to the constructor of the `Translator` class
 
 3.4.0
 -----
diff --git a/src/Symfony/Component/Translation/Translator.php b/src/Symfony/Component/Translation/Translator.php
index 5ed01af58b..f691e65ba6 100644
--- a/src/Symfony/Component/Translation/Translator.php
+++ b/src/Symfony/Component/Translation/Translator.php
@@ -85,14 +85,11 @@ class Translator implements TranslatorInterface, TranslatorBagInterface
      *
      * @throws InvalidArgumentException If a locale contains invalid characters
      */
-    public function __construct($locale, $formatter = null, $cacheDir = null, $debug = false)
+    public function __construct($locale, MessageFormatterInterface $formatter = null, $cacheDir = null, $debug = false)
     {
         $this->setLocale($locale);
 
-        if ($formatter instanceof MessageSelector) {
-            $formatter = new MessageFormatter($formatter);
-            @trigger_error(sprintf('Passing a "%s" instance into the "%s" as a second argument is deprecated since version 3.4 and will be removed in 4.0. Inject a "%s" implementation instead.', MessageSelector::class, __METHOD__, MessageFormatterInterface::class), E_USER_DEPRECATED);
-        } elseif (null === $formatter) {
+        if (null === $formatter) {
             $formatter = new MessageFormatter();
         }