diff --git a/packages/extension-ui/package.json b/packages/extension-ui/package.json
index c2b71848..35dcea57 100644
--- a/packages/extension-ui/package.json
+++ b/packages/extension-ui/package.json
@@ -14,7 +14,7 @@
     "type": "git",
     "url": "https://github.com/polkadot-js/extension.git"
   },
-  "sideEffects": false,
+  "sideEffects": true,
   "type": "module",
   "version": "0.40.4",
   "dependencies": {