diff --git a/package.json b/package.json
index 437f54f..54469ea 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
   "version": "5.2.2",
   "description": "Fastify PostgreSQL connection plugin",
   "main": "index.js",
+  "type": "commonjs",
   "types": "index.d.ts",
   "scripts": {
     "check-examples": "tsc --build examples/typescript/*",