diff --git a/package.json b/package.json
index c06a7c516..fa4fe3eff 100644
--- a/package.json
+++ b/package.json
@@ -44,6 +44,7 @@
     ]
   },
   "scripts": {
+    "preinstall": "npm run build",
     "build": "npx webpack && npx sass ./src/css/BookReader.scss > ./BookReader/BookReader.css",
     "eslint": "eslint ./BookReader/BookReader.js",
     "lint": "eslint \"./**/*.js\"",