diff --git a/src/Metadata/Cache/FileCache.php b/src/Metadata/Cache/FileCache.php
index 66c768d..10779a4 100644
--- a/src/Metadata/Cache/FileCache.php
+++ b/src/Metadata/Cache/FileCache.php
@@ -40,7 +40,7 @@ public function putClassMetadataInCache(ClassMetadata $metadata)
     {
         $path = $this->dir.'/'.strtr($metadata->name, '\\', '-').'.cache.php';
 
-        $tmpFile = tempnam(sys_get_temp_dir(), 'metadata-cache');
+        $tmpFile = tempnam($this->dir, 'metadata-cache');
         file_put_contents($tmpFile, '<?php return unserialize('.var_export(serialize($metadata), true).');');
 
         if (false === @rename($tmpFile, $path)) {