diff --git a/package.json b/package.json
index f194e58..166af13 100644
--- a/package.json
+++ b/package.json
@@ -91,6 +91,7 @@
     "webpack-cli": "^3.3.12"
   },
   "scripts": {
+    "prepare": "npm run build",
     "prebuild": "rimraf dist/ && rimraf build/ && mkdirp dist && mkdirp build",
     "build": "tsc --module commonjs && rollup -c rollup.config.ts && npm run build:create-reftest-list && npm run build:testrunner && npm run build:minify",
     "build:testrunner": "rollup -c tests/rollup.config.ts",