diff --git a/.github/workflows/build_push.yml b/.github/workflows/build_push.yml
index 6d75cf33..8c41bc97 100644
--- a/.github/workflows/build_push.yml
+++ b/.github/workflows/build_push.yml
@@ -94,6 +94,7 @@ jobs:
           rm -rf gh-pages/*
           cp -r master/build/* gh-pages
           cd gh-pages
+          cp index.html 404.html
           git add -A
           git config --global user.email "github-actions[bot]@users.noreply.github.com"
           git config --global user.name "github-actions[bot]"