diff --git a/package.json b/package.json
index a08575a2..95be4126 100644
--- a/package.json
+++ b/package.json
@@ -2,6 +2,7 @@
   "name": "@vector-im/compound-design-tokens",
   "version": "1.5.0",
   "description": "Compound design tokens",
+  "sideEffects": false,
   "scripts": {
     "build": "tsx ./build.ts",
     "dev": "http-server .",