diff --git a/types/koa/index.d.ts b/types/koa/index.d.ts
index 85a75a92aa..cd35fc7e3a 100644
--- a/types/koa/index.d.ts
+++ b/types/koa/index.d.ts
@@ -513,7 +513,7 @@ declare class Application<
      * Return a request handler callback
      * for node's native http/http2 server.
      */
-    callback(): (req: IncomingMessage | Http2ServerRequest, res: ServerResponse | Http2ServerResponse) => void;
+    callback(): (req: IncomingMessage | Http2ServerRequest, res: ServerResponse | Http2ServerResponse) => Promise<void>;
 
     /**
      * Initialize a new context.