diff --git a/package.json b/package.json
index 82b01dd..a2086bd 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,6 @@
   "name": "@recogito/recogito-client-core",
   "version": "1.2.1",
   "description": "Core functions, classes and components for RecogitoJS",
-  "sideEffects": false,
   "main": "src/index.js",
   "scripts": {
     "test": "NODE_ENV=test ./node_modules/.bin/mocha --require @babel/register"