diff --git a/package/package.json b/package/package.json
index c963181..3b41ed9 100644
--- a/package/package.json
+++ b/package/package.json
@@ -10,6 +10,7 @@
   },
   "typings": "types/ssr-window.d.ts",
   "type": "module",
+  "sideEffects": false,
   "repository": {
     "type": "git",
     "url": "git+https://github.com/nolimits4web/ssr-window.git"
@@ -25,4 +26,4 @@
     "url": "https://github.com/nolimits4web/ssr-window/issues"
   },
   "homepage": "https://github.com/nolimits4web/ssr-window"
-}
\ No newline at end of file
+}