diff --git a/package.json b/package.json
index ca80eea..d52500b 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "description": "Stateless privacy-protecting URL redirecting service for the Matrix.org ecosystem",
   "main": "src/index.js",
   "scripts": {
-    "build": "NODE_ENV=production webpack -p src/index.js bundle.js",
+    "build": "cross-env NODE_ENV=production webpack -p src/index.js bundle.js",
     "start": "webpack -w src/index.js bundle.js",
     "test": "echo \"Error: no test specified\" && exit 1",
     "clean": "rm bundle.js bundle.js.map"
@@ -28,6 +28,7 @@
     "babel-loader": "^6.2.4",
     "babel-preset-es2015": "^6.6.0",
     "babel-preset-react": "^6.5.0",
+    "cross-env": "^5.0.5",
     "source-map-loader": "^0.1.5",
     "webpack": "^1.13.0"
   }