diff --git a/src/challenges/chess-simp/2022-01.ts b/src/challenges/chess-simp/2022-01.ts
index d7afafd..833c61d 100644
--- a/src/challenges/chess-simp/2022-01.ts
+++ b/src/challenges/chess-simp/2022-01.ts
@@ -5,7 +5,7 @@ import { legalMoves_slow } from '@/move/legal'
 import { isPawn } from '@/piece'
 
 export class Challenge_2022_01_29 implements Challenge {
-  meta = {
+  meta: Challenge['meta'] = {
     uuid: '1515dfc7-4ed7-444d-a8cb-ac6b35e699bd',
     title: 'Our Kings Almost Touched',
     link: 'https://www.youtube.com/watch?v=sEdZU-0oHdM',