diff --git a/apps/web/vite.config.ts b/apps/web/vite.config.ts
index 4955c33..0156a41 100644
--- a/apps/web/vite.config.ts
+++ b/apps/web/vite.config.ts
@@ -82,6 +82,9 @@ function buildInfo() {
   return { __APP_VERSION__: JSON.stringify(version), __APP_BUILD__: JSON.stringify(build) };
 }
 
+/** Host names the dev and preview servers answer to, besides localhost and IP addresses. */
+const ALLOWED_HOSTS = ["deadhead.belowland.com"];
+
 export default defineConfig({
   define: buildInfo(),
   plugins: [react(), tailwindcss(), omitSourceArt(), pwa],
@@ -90,5 +93,7 @@ export default defineConfig({
     // IPv4 only, so target 127.0.0.1 rather than localhost.
     // API_PROXY_TARGET lets a second dev stack (e.g. screenshots) use another API port.
     proxy: { "/api": process.env.API_PROXY_TARGET ?? "http://127.0.0.1:3000" },
+    allowedHosts: ALLOWED_HOSTS,
   },
+  preview: { allowedHosts: ALLOWED_HOSTS },
 });