diff --git a/package.json b/package.json
index 6300d38..4888735 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
     "url": "https://github.com/jupyterlite/cockle/issues"
   },
   "files": [
-    "lib/",
+    "lib/**/*.{d.ts,eot,gif,html,jpg,js,js.map,json,png,svg,woff2,ttf}",
     "src/**/*.ts"
   ],
   "main": "lib/index.js",