diff --git a/frontend-bundler/package.json b/frontend-bundler/package.json
index 4bc1b9c4e..62a0b85e1 100644
--- a/frontend-bundler/package.json
+++ b/frontend-bundler/package.json
@@ -6,8 +6,9 @@
     "version": "1.0.0",
     "description": "",
     "scripts": {
+        "clean": "rm -rf ../frontend-dist ../frontend-dist-static",
         "start": "cd ../frontend && parcel --dist-dir ../frontend-dist --config ../frontend-bundler/.parcelrc editor.html index.html error.jl.html",
-        "build": "cd ../frontend && parcel build --no-source-maps --public-url . --dist-dir ../frontend-dist --config ../frontend-bundler/.parcelrc editor.html index.html error.jl.html && node ../frontend-bundler/add_sri.js ../frontend-dist/editor.html",
+        "build": "npm run clean && cd ../frontend && parcel build --no-source-maps --public-url . --dist-dir ../frontend-dist --config ../frontend-bundler/.parcelrc editor.html index.html error.jl.html && node ../frontend-bundler/add_sri.js ../frontend-dist/editor.html",
         "test": "echo \"Error: no test specified\" && exit 1"
     },
     "author": "",