diff --git a/package.json b/package.json
index 4921869..2028d1a 100644
--- a/package.json
+++ b/package.json
@@ -24,5 +24,9 @@
     "type": "git",
     "url": "git@github.com:Automattic/engine.io-parser.git"
   },
+  "files": [
+    "index.js",
+    "lib/"
+  ],
   "browser": "./lib/browser.js"
 }