diff --git a/classes/cache/CacheFile.class.php b/classes/cache/CacheFile.class.php
index 666e8d23f..ee90dd4c8 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);
+		return $this->cache_dir . str_replace(':', '/', $key);
 	}
 
 	/**