diff --git a/types/basic-auth/index.d.ts b/types/basic-auth/index.d.ts
index 3af8f5a699..ad1b09f746 100644
--- a/types/basic-auth/index.d.ts
+++ b/types/basic-auth/index.d.ts
@@ -1,14 +1,15 @@
 // Type definitions for basic-auth 1.1
 // Project: https://github.com/jshttp/basic-auth
-// Definitions by: Clément Bourgeois <https://github.com/moonpyk>, Vesa Poikajärvi <https://github.com/vesse>
+// Definitions by: Clément Bourgeois <https://github.com/moonpyk>, Vesa Poikajärvi <https://github.com/vesse>, Ryo Ota <https://github.com/nwtgck>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 /// <reference types="node" />
 
 import * as http from 'http';
+import * as http2 from 'http2';
 
 // See https://github.com/jshttp/basic-auth/blob/v1.1.0/index.js#L49
-declare function auth(req: http.IncomingMessage): auth.BasicAuthResult | undefined;
+declare function auth(req: http.IncomingMessage | http2.Http2ServerRequest): auth.BasicAuthResult | undefined;
 
 declare namespace auth {
     interface BasicAuthResult {