diff --git a/package.json b/package.json
index 3777b2e5..120e3137 100644
--- a/package.json
+++ b/package.json
@@ -110,6 +110,7 @@
   "license": "MIT",
   "devDependencies": {
     "chai": "4.1.2",
+    "cross-env": "5.2.0",
     "eslint": "4.13.1",
     "mocha-sinon": "1.2.0",
     "npm-run-all": "4.1.3",