diff --git a/package.json b/package.json
index 1612519..de69a68 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,7 @@
     "type": "opencollective",
     "url": "https://opencollective.com/express"
   },
+  "type": "commonjs",
   "dependencies": {
     "debug": "^4.4.3",
     "encodeurl": "^2.0.0",