diff --git a/README.md b/README.md
index 6d152ee..e9d227c 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 Shadowsocks for iOS and OSX
 ===========================
-[![Build Status](https://travis-ci.org/shadowsocks/shadowsocks-iOS.png?branch=master)](https://travis-ci.org/shadowsocks/shadowsocks-iOS)
+[![Build Status](https://travis-ci.org/shadowsocks/shadowsocks-iOS.svg?branch=master)](https://travis-ci.org/shadowsocks/shadowsocks-iOS)
 
 
 iOS