diff --git a/restify/restify.d.ts b/restify/restify.d.ts
index 7128ca3d07..e890ef2b2e 100644
--- a/restify/restify.d.ts
+++ b/restify/restify.d.ts
@@ -34,6 +34,7 @@ declare module "restify" {
     params: any;
 
     body?: any; //available when bodyParser plugin is used
+    isSecure: () => boolean;
   }
 
   interface Response extends http.ServerResponse {