diff --git a/package.json b/package.json
index b6547ab8..45d039a2 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
   "scripts": {
     "test": "cd backend && npm install && npm test",
     "start": "node ./backend/build/backend/src/migrate-to-latest.js && node ./backend/build/backend/src/index.js",
-    "heroku-postbuild": "cd frontend && npm install && npm run build && cd ../backend && npm install"
+    "heroku-postbuild": "cd frontend && npm install && npm run build && cd ../backend && npm install && npm run-script build"
   },
   "repository": {
     "type": "git",