diff --git a/lib/index.js b/lib/index.js
index b50b50e..5c35ff9 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -3,7 +3,11 @@ const path = require('path');
 const BinWrapper = require('bin-wrapper');
 const pkg = require('../package.json');
 
-const url = `https://raw.githubusercontent.com/imagemin/pngquant-bin/v${pkg.version}/vendor/`;
+const site = process.env.PNGQUANT_BINARY_SITE ||
+            process.env.npm_config_pngquant_binary_site ||
+            'https://raw.githubusercontent.com';
+
+const url = `${site}/imagemin/pngquant-bin/v${pkg.version}/vendor/`;
 
 module.exports = new BinWrapper()
 	.src(`${url}macos/pngquant`, 'darwin')