diff --git a/package.json b/package.json
index fb337fa..c6bf243 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "build-data-files": "python firefox/build-package.py && python chrome/build-manifest.py",
     "distribute": "cp -r build/* firefox/data/ && cp -r build/* chrome/data/",
     "build": "npm run clean && npm run create-dirs && npm run build-js && npm run distribute && npm run build-data-files && npm run build-extensions",
-    "clean": "rm -rf firefox/data chrome/data node_modules/"
+    "clean": "rm -rf firefox/data chrome/data node_modules/ build/"
   },
   "repository": {
     "type": "git",