diff --git a/package.json b/package.json
index 90989f4..e0fb4e1 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "description": "YAML plugin for the Monaco Editor",
   "homepage": "https://monaco-yaml.js.org",
   "scripts": {
-    "prepack": "node build.js",
+    "prepack": "node build.cjs",
     "prepare": "husky install"
   },
   "type": "module",