diff --git a/app/javascript/mastodon/selectors/contexts.ts b/app/javascript/mastodon/selectors/contexts.ts
index 1c76d7cc82..213f93e800 100644
--- a/app/javascript/mastodon/selectors/contexts.ts
+++ b/app/javascript/mastodon/selectors/contexts.ts
@@ -41,7 +41,7 @@ export const getDescendantsIds = createAppSelector(
       }
 
       if (replies) {
-        replies.reverse().forEach((replyId) => {
+        replies.toReversed().forEach((replyId) => {
           if (
             !visitIds.includes(replyId) &&
             !descendantsIds.includes(replyId) &&