diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index be1487138..187a09408 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -105,6 +105,7 @@ build-production:
     # # Fail if files got changed.
     # # https://stackoverflow.com/a/9066385
     # - git diff --quiet
+    - cp static/index.html static/404.html
   variables:
     NODE_ENV: production
   artifacts: