diff --git a/package.json b/package.json
index 1ea7221..740d496 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
     "test": "test"
   },
   "scripts": {
-    "build": "NODE_ENV=production babel src --out-dir lib --source-maps",
+    "build": "cross-env NODE_ENV=production babel src --out-dir lib --source-maps",
     "watch": "babel src --out-dir lib --watch --source-maps",
     "prepublish": "npm run --if-present build",
     "test": "mocha"
@@ -44,6 +44,7 @@
     "babel-traverse": "^6.7.3",
     "babel-types": "^6.7.2",
     "babylon": "^6.7.0",
+    "cross-env": "^3.1.4",
     "escodegen": "^1.8.0",
     "esprima": "^3.1.1",
     "estraverse": "^4.2.0",