diff --git a/package.json b/package.json
index e7f0662..bd5c6e6 100644
--- a/package.json
+++ b/package.json
@@ -34,6 +34,6 @@
     "test": "mocha test.js"
   },
   "files": [
-    "*"
+    "*", "!build", "!build-umd.js"
   ]
 }