diff --git a/package.json b/package.json
index 97fd9c05..950b0613 100644
--- a/package.json
+++ b/package.json
@@ -4,6 +4,10 @@
   "description": "istanbul reports",
   "author": "Krishnan Anantheswaran <kananthmail-github@yahoo.com>",
   "main": "index.js",
+  "files": [
+    "index.js",
+    "lib"
+  ],
   "scripts": {
     "pretest": "jshint --exclude=**/prettify.js index.js lib/ test/",
     "test": "nyc --all mocha --recursive test/",