diff --git a/build/build-css.js b/build/build-css.js
index 0eff9c9b7..8345af2db 100644
--- a/build/build-css.js
+++ b/build/build-css.js
@@ -1,3 +1,5 @@
+#!/usr/bin/env node
+
 'use strict'
 
 const fs = require('fs')