diff --git a/packages/frontend/src/components/MkTimeline.vue b/packages/frontend/src/components/MkTimeline.vue
index 15b9da7655..7b740167ec 100644
--- a/packages/frontend/src/components/MkTimeline.vue
+++ b/packages/frontend/src/components/MkTimeline.vue
@@ -75,7 +75,7 @@ const tlComponent = useTemplateRef('tlComponent');
 
 let tlNotesCount = 0;
 
-function prepend(note) {
+function prepend(note: Misskey.entities.Note) {
 	if (tlComponent.value == null) return;
 
 	tlNotesCount++;