diff --git a/package.json b/package.json
index ed26c95..86c9014 100644
--- a/package.json
+++ b/package.json
@@ -50,6 +50,9 @@
   "engines": {
     "node": ">= 8"
   },
+  "files": [
+    "index.js"
+  ],
   "scripts": {
     "clean": "rm -rf node_modules",
     "coverage": "nyc report --reporter=text-lcov | coveralls",