diff --git a/package.json b/package.json
index 5b75ea37..b625a16d 100644
--- a/package.json
+++ b/package.json
@@ -30,5 +30,9 @@
     "chai": "^4.1.1",
     "istanbul": "^0.4.5",
     "mocha": "^3.5.0"
-  }
+  },
+  "files": [
+    "index.js",
+    "index.d.ts"
+  ]
 }