diff --git a/package.json b/package.json
index 8921cc1b4..a80b7e28e 100644
--- a/package.json
+++ b/package.json
@@ -9,12 +9,12 @@
     "ui": "npm run test:flat:build:states && beefy development/ui-dev.js:bundle.js --live --open --index=./development/index.html --cwd ./",
     "mock": "beefy development/mock-dev.js:bundle.js --live --open --index=./development/index.html --cwd ./",
     "watch": "mocha watch --recursive \"test/unit/**/*.js\"",
-    "mascara": "gulp build && METAMASK_DEBUG=true node ./mascara/example/server",
+    "mascara": "gulp build && cross-env METAMASK_DEBUG=true node ./mascara/example/server",
     "dist": "npm run dist:clear && npm install && gulp dist",
     "dist:clear": "rm -rf node_modules/eth-contract-metadata && rm -rf node_modules/eth-phishing-detect",
     "test": "npm run lint && npm run test:coverage && npm run test:integration",
-    "test:unit": "METAMASK_ENV=test mocha --exit --require babel-core/register --require test/helper.js --recursive \"test/unit/**/*.js\"",
-    "test:single": "METAMASK_ENV=test mocha --require test/helper.js",
+    "test:unit": "cross-env METAMASK_ENV=test mocha --exit --require babel-core/register --require test/helper.js --recursive \"test/unit/**/*.js\"",
+    "test:single": "cross-env METAMASK_ENV=test mocha --require test/helper.js",
     "test:integration": "npm run test:integration:build && npm run test:flat && npm run test:mascara",
     "test:integration:build": "gulp build:scss",
     "test:coverage": "nyc npm run test:unit && npm run test:coveralls-upload",
@@ -193,6 +193,7 @@
     "chai": "^4.1.0",
     "compression": "^1.7.1",
     "coveralls": "^3.0.0",
+    "cross-env": "^5.1.4",
     "deep-freeze-strict": "^1.1.1",
     "del": "^3.0.0",
     "envify": "^4.0.0",