diff --git a/package.json b/package.json
index b060929e..610a01d2 100644
--- a/package.json
+++ b/package.json
@@ -7,6 +7,7 @@
   "unpkg": "dist/formatter.js",
   "typings": "dist/index.d.ts",
   "scripts": {
+    "prepare": "npm run build",
     "test": "jest --coverage",
     "test:watch": "jest --watch",
     "build": "rollup -c",