diff --git a/package.json b/package.json
index 8fada0ca2..d972a5192 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
   "funding": "https://github.com/kitajs/html?sponsor=1",
   "license": "Apache-2.0",
   "author": "arthurfiorette <npm@arthur.place>",
-  "sideEffects": false,
+  "sideEffects": ["register.js"],
   "main": "index.js",
   "types": "index.d.ts",
   "scripts": {