diff --git a/src/Symfony/Contracts/Translation/TranslatorTrait.php b/src/Symfony/Contracts/Translation/TranslatorTrait.php
index ee026e2e3b..68050ee4a1 100644
--- a/src/Symfony/Contracts/Translation/TranslatorTrait.php
+++ b/src/Symfony/Contracts/Translation/TranslatorTrait.php
@@ -35,7 +35,7 @@ trait TranslatorTrait
      */
     public function getLocale()
     {
-        return $this->locale ?: \Locale::getDefault();
+        return $this->locale ?: (class_exists(\Locale::class) ? \Locale::getDefault() : 'en');
     }
 
     /**