diff --git a/packages/cli/src/lib/bundler/server.ts b/packages/cli/src/lib/bundler/server.ts
index 34284ead18..5fc3a7b5de 100644
--- a/packages/cli/src/lib/bundler/server.ts
+++ b/packages/cli/src/lib/bundler/server.ts
@@ -58,6 +58,8 @@ export async function serveBundle(options: ServeOptions) {
     host,
     port,
     proxy: pkg.proxy,
+    // When the dev server is behind a proxy, the host and public hostname differ
+    allowedHosts: [url.hostname],
   });
 
   await new Promise<void>((resolve, reject) => {