diff --git a/types/vhost/index.d.ts b/types/vhost/index.d.ts
index a26e8e662f..6a19d9c965 100644
--- a/types/vhost/index.d.ts
+++ b/types/vhost/index.d.ts
@@ -5,6 +5,6 @@
 
 import express = require('express');
 
-declare function vhost(hostname: string, handler: express.Handler): string;
+declare function vhost(hostname: string | RegExp, handler: express.Handler): string;
 
 export = vhost;