diff --git a/package.json b/package.json
index 061f32cf..e36aecc8 100644
--- a/package.json
+++ b/package.json
@@ -12,8 +12,8 @@
   "scripts": {
     "build": "yarn build-js-all && yarn copy-styles && yarn build-styles",
     "build-js-all": "yarn build-js-esm && yarn build-js-umd",
-    "build-js-esm": "cross-env BABEL_ENV=production-esm babel src -d dist/esm --ignore **/*.spec.js,**/*.spec.jsx",
-    "build-js-umd": "cross-env BABEL_ENV=production-umd babel src -d dist/umd --ignore **/*.spec.js,**/*.spec.jsx",
+    "build-js-esm": "cross-env BABEL_ENV=production-esm babel src -d dist/esm --ignore \"**/*.spec.js,**/*.spec.jsx\"",
+    "build-js-umd": "cross-env BABEL_ENV=production-umd babel src -d dist/umd --ignore \"**/*.spec.js,**/*.spec.jsx\"",
     "build-styles": "lessc ./dist/Calendar.less ./dist/Calendar.css",
     "clean": "rimraf dist",
     "copy-styles": "node ./copy-styles.js",