diff --git a/src/Symfony/Component/Config/Resource/ComposerResource.php b/src/Symfony/Component/Config/Resource/ComposerResource.php
index c826d1bb7512..9fb304bea8f0 100644
--- a/src/Symfony/Component/Config/Resource/ComposerResource.php
+++ b/src/Symfony/Component/Config/Resource/ComposerResource.php
@@ -48,7 +48,7 @@ public function isFresh($timestamp)
     {
         self::refresh();
 
-        return self::$runtimeVendors === $this->vendors;
+        return array_values(self::$runtimeVendors) === array_values($this->vendors);
     }
 
     /**