diff --git a/public/docs/_examples/toh-4/ts/app/mock-heroes.ts b/public/docs/_examples/toh-4/ts/app/mock-heroes.ts
index 69afde3d34..6f7c5d83a0 100644
--- a/public/docs/_examples/toh-4/ts/app/mock-heroes.ts
+++ b/public/docs/_examples/toh-4/ts/app/mock-heroes.ts
@@ -1,7 +1,7 @@
 // #docregion
 import { Hero } from './hero';
 
-export var HEROES: Hero[] = [
+export const HEROES: Hero[] = [
   {id: 11, name: 'Mr. Nice'},
   {id: 12, name: 'Narco'},
   {id: 13, name: 'Bombasto'},