diff --git a/lib/server.ts b/lib/server.ts
index 2dba26db..355e14d5 100644
--- a/lib/server.ts
+++ b/lib/server.ts
@@ -16,6 +16,7 @@ import type { CookieSerializeOptions } from "cookie";
 import type { CorsOptions, CorsOptionsDelegate } from "cors";
 import type { Duplex } from "stream";
 import { WebTransport } from "./transports/webtransport";
+import { TextDecoder } from "util";
 
 const debug = debugModule("engine");