diff --git a/lib/Cake/Cache/Engine/FileEngine.php b/lib/Cake/Cache/Engine/FileEngine.php
index <HASH>..<HASH> 100644
--- a/lib/Cake/Cache/Engine/FileEngine.php
+++ b/lib/Cake/Cache/Engine/FileEngine.php
@@ -388,7 +388,7 @@ class FileEngine extends CacheEngine {
 			return false;
 		}
 
-		$key = Inflector::underscore(str_replace(array(DS, '/', '.','<','>','?',':','|','*','"'), '_', strval($key)));
+		$key = Inflector::underscore(str_replace(array(DS, '/', '.', '<', '>', '?', ':', '|', '*', '"'), '_', strval($key)));
 		return $key;
 	}
convert forbidden character in filename(Windows) with underline