diff --git a/components/conversation/ConversationPaginator.vue b/components/conversation/ConversationPaginator.vue
index d69d5ea8..e41292c4 100644
--- a/components/conversation/ConversationPaginator.vue
+++ b/components/conversation/ConversationPaginator.vue
@@ -5,7 +5,7 @@ const { paginator } = defineProps<{
   paginator: Paginator<mastodon.v1.Conversation[], mastodon.DefaultPaginationParams>
 }>()
 
-function preprocess(items: mastodon.v1.Conversation[]) {
+function preprocess(items: mastodon.v1.Conversation[]): mastodon.v1.Conversation[] {
   return items.filter(items => !items.lastStatus?.filtered?.find(
     filter => filter.filter.filterAction === 'hide' && filter.filter.context.includes('thread'),
   ))