diff --git a/app/index.tsx b/app/index.tsx
index 76eaa45..0584c40 100644
--- a/app/index.tsx
+++ b/app/index.tsx
@@ -11,7 +11,7 @@ import { counterApp } from './reducers';
 declare const require: (name: String) => any;
 
 interface IHotModule {
-  hot?: { accept: (path: string, callback: () => void) => void };
+  hot?: { accept: (path?: string, callback?: () => void) => void };
 };
 
 declare const module: IHotModule;