diff --git a/express/express.d.ts b/express/express.d.ts
index 0a7aa0057..0bd42b82f 100644
--- a/express/express.d.ts
+++ b/express/express.d.ts
@@ -349,6 +349,11 @@ declare module "express" {
             /**
              * Parse the "Host" header field hostname.
              */
+            hostname: string;
+
+            /**
+             * @deprecated Use hostname instead.
+             */
             host: string;
 
             /**