diff --git a/caches/FileCache.php b/caches/FileCache.php
index d5817a2d..45536bf6 100644
--- a/caches/FileCache.php
+++ b/caches/FileCache.php
@@ -80,9 +80,6 @@ class FileCache implements CacheInterface
 
     public function setKey($key)
     {
-        if (!empty($key) && is_array($key)) {
-            $key = array_map('strtolower', $key);
-        }
         $key = json_encode($key);
 
         if (!is_string($key)) {