diff --git a/src/Symfony/Bridge/Twig/Extension/TranslationExtension.php b/src/Symfony/Bridge/Twig/Extension/TranslationExtension.php
index b8a0eb6154..46fdd9e7b7 100644
--- a/src/Symfony/Bridge/Twig/Extension/TranslationExtension.php
+++ b/src/Symfony/Bridge/Twig/Extension/TranslationExtension.php
@@ -33,12 +33,6 @@ use Twig\TwigFilter;
  */
 class TranslationExtension extends AbstractExtension
 {
-    use TranslatorTrait {
-        getLocale as private;
-        setLocale as private;
-        trans as private doTrans;
-    }
-
     private $translator;
     private $translationNodeVisitor;
 
@@ -115,7 +109,9 @@ class TranslationExtension extends AbstractExtension
             $arguments['%count%'] = $count;
         }
         if (null === $this->translator) {
-            return $this->doTrans($message, $arguments, $domain, $locale);
+            $this->translator = new class() implements TranslatorInterface {
+                use TranslatorTrait;
+            };
         }
 
         return $this->translator->trans($message, $arguments, $domain, $locale);
@@ -127,8 +123,11 @@ class TranslationExtension extends AbstractExtension
     public function transchoice($message, $count, array $arguments = [], $domain = null, $locale = null)
     {
         if (null === $this->translator) {
-            return $this->doTrans($message, array_merge(['%count%' => $count], $arguments), $domain, $locale);
+            $this->translator = new class() implements TranslatorInterface {
+                use TranslatorTrait;
+            };
         }
+
         if ($this->translator instanceof TranslatorInterface) {
             return $this->translator->trans($message, array_merge(['%count%' => $count], $arguments), $domain, $locale);
         }
diff --git a/src/Symfony/Component/Translation/composer.json b/src/Symfony/Component/Translation/composer.json
index 25aaf6fb55..04b7d39fd4 100644
--- a/src/Symfony/Component/Translation/composer.json
+++ b/src/Symfony/Component/Translation/composer.json
@@ -26,6 +26,7 @@
         "symfony/dependency-injection": "~3.4|~4.0",
         "symfony/http-kernel": "~3.4|~4.0",
         "symfony/intl": "~3.4|~4.0",
+        "symfony/service-contracts": "^1.1.2",
         "symfony/var-dumper": "~3.4|~4.0",
         "symfony/yaml": "~3.4|~4.0",
         "symfony/finder": "~2.8|~3.0|~4.0",