diff --git a/package.json b/package.json
index 7ae5b1e..f4629e2 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,7 @@
   "repository": "vaadin/vaadin-development-mode-detector",
   "author": "Vaadin Ltd",
   "license": "Apache-2.0",
+  "type": "module",
   "devDependencies": {
     "polymer-cli": "^1.7.7"
   },