diff --git a/classes/cache/CacheFile.class.php b/classes/cache/CacheFile.class.php
index e7b6d5991..85210a4ff 100644
--- a/classes/cache/CacheFile.class.php
+++ b/classes/cache/CacheFile.class.php
@@ -49,7 +49,7 @@ class CacheFile extends CacheBase
 	 */
 	function getCacheFileName($key)
 	{
-		return $this->cache_dir . str_replace(':', '/', $key) . '.php';
+		return $this->cache_dir . str_replace(':', DIRECTORY_SEPARATOR, $key) . '.php';
 	}
 
 	/**