diff --git a/lib/index.ts b/lib/index.ts
index 97cf8882bbf482..bd6ba51d69091b 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -20,6 +20,9 @@ const server = serve({
     fetch: app.fetch,
     hostname: config.listenInaddrAny ? '::' : '127.0.0.1',
     port,
+    serverOptions: {
+        maxHeaderSize: 1024 * 64,
+    },
 });
 
 export default server;