diff --git a/deploy/install.sh b/deploy/install.sh
index 7225727..c784a6d 100644
--- a/deploy/install.sh
+++ b/deploy/install.sh
@@ -43,7 +43,9 @@ fi
 
 echo "==> Building"
 cd "$INSTALL_DIR"
-npm ci
+# Build tooling (TypeScript/Vite) lives in devDependencies, so install those even when
+# NODE_ENV=production is set in the environment.
+npm ci --include=dev
 npm run build
 
 echo "==> Writing systemd unit /etc/systemd/system/$SERVICE.service"