diff --git a/package.json b/package.json
index 4f1217f..b96f87d 100644
--- a/package.json
+++ b/package.json
@@ -24,6 +24,7 @@
     }
   },
   "scripts": {
+    "postinstall": "npm run build",
     "build": "bun run build:cjs && bun run build:esm && bun run build:types",
     "build:cjs": "tsc -p tsconfig.cjs.json",
     "build:esm": "echo 'ESM build disabled - use CommonJS for now'",