diff --git a/SrcParseS.js b/SrcParseS.js
index ae3c94b5..155b163a 100644
--- a/SrcParseS.js
+++ b/SrcParseS.js
@@ -683,7 +683,7 @@ var SrcParseS = {
                     blockRules: ['.m4a','.mp3','.gif','.jpg','.jpeg','.png','.ico','hm.baidu.com','/ads/*.js','/klad/*.php','layer.css'],
                     jsLoadingInject: true,
                     js: js,
-                    ua: head['User-Agent'] || MOBILE_UA,
+                    ua: head['user-agent'] || MOBILE_UA,
                     referer: head['referer'] || undefined,
                     checkTime: 100,
                     timeout: 12000