diff --git a/package.json b/package.json
index 364aecb..e78e919 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
     },
     "./": "./"
   },
+  "files": ["index.js", "index.mjs", "index.d.ts"],
   "scripts": {
     "test": "standard && ava -v test/*.test.js && tsd"
   },