diff --git a/types/http-proxy-middleware/http-proxy-middleware-tests.ts b/types/http-proxy-middleware/http-proxy-middleware-tests.ts
index aae082a956..9967dedcd9 100644
--- a/types/http-proxy-middleware/http-proxy-middleware-tests.ts
+++ b/types/http-proxy-middleware/http-proxy-middleware-tests.ts
@@ -140,3 +140,6 @@ proxy({
 proxy({
   headers: {host: 'www.example.org'}
 });
+
+// Shorthands
+proxy('/');
diff --git a/types/http-proxy-middleware/index.d.ts b/types/http-proxy-middleware/index.d.ts
index 09b80e21c4..13f2669e5f 100644
--- a/types/http-proxy-middleware/index.d.ts
+++ b/types/http-proxy-middleware/index.d.ts
@@ -15,7 +15,7 @@ import * as httpProxy from "http-proxy";
 import { Readable } from 'stream';
 
 declare function proxy(config: proxy.Config): proxy.Proxy;
-declare function proxy(contextOrUri: string | string[] | proxy.Filter, config: proxy.Config): proxy.Proxy;
+declare function proxy(contextOrUri: string | string[] | proxy.Filter, config?: proxy.Config): proxy.Proxy;
 
 declare namespace proxy {
   type Filter = (pathname: string, req: http.IncomingMessage) => boolean;