diff --git a/tools/build.sh b/tools/build.sh
index a976869..2c5d91f 100755
--- a/tools/build.sh
+++ b/tools/build.sh
@@ -9,3 +9,5 @@ apt-get install -y asymptote texlive-latex-extra texlive-fonts-recommended libxk
 yarn install --production --frozen-lockfile
 yarn playwright install-deps chromium
 yarn build
+
+mv dist/index.html dist/404.html