diff --git a/wsproxy/wsproxy-udp.js b/wsproxy/wsproxy-udp.js
old mode 100644
new mode 100755
index b81e2bd..db63b82
--- a/wsproxy/wsproxy-udp.js
+++ b/wsproxy/wsproxy-udp.js
@@ -1,3 +1,5 @@
+#!/usr/bin/env node
+
 /* 
  * @author: Wentao Shang
  * See COPYING for copyright and distribution information.