diff --git a/bin/customs_server.js b/bin/customs_server.js
old mode 100644
new mode 100755
index 2b4d1ac..d69cbcd
--- a/bin/customs_server.js
+++ b/bin/customs_server.js
@@ -1,3 +1,5 @@
+#!/usr/bin/env node
+
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */