diff --git a/package.json b/package.json
index 4446fae0e..e8ff766b9 100644
--- a/package.json
+++ b/package.json
@@ -31,8 +31,8 @@
     "pretest": "npm run lint --silent",
     "test": "standard && gulp test",
     "lint": "bundle && bundle exec govuk-lint-sass assets/sass/elements/",
-    "postinstall": "gulp build",
-    "start": "gulp develop"
+    "start": "gulp develop",
+    "heroku-postbuild": "gulp build"
   },
   "standard": {
     "ignore": [