diff --git a/package.json b/package.json
index 2873393..c09f75f 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
   "version": "8.3.0",
   "description": "Measure process load with automatic handling of 'Service Unavailable' plugin for Fastify.",
   "main": "index.js",
+  "type": "commonjs",
   "types": "types/index.d.ts",
   "scripts": {
     "lint": "standard | snazzy",