diff --git a/src/Symfony/Component/Translation/Translator.php b/src/Symfony/Component/Translation/Translator.php
index 75ac17c78803..328ec091cde3 100644
--- a/src/Symfony/Component/Translation/Translator.php
+++ b/src/Symfony/Component/Translation/Translator.php
@@ -171,7 +171,7 @@ public function setLocale($locale)
      */
     public function getLocale()
     {
-        return $this->locale ?? \Locale::getDefault();
+        return $this->locale ?? (class_exists(\Locale::class) ? \Locale::getDefault() : 'en');
     }
 
     /**