diff --git a/packages/backend/src/misc/renote.ts b/packages/backend/src/misc/renote.ts
index 015c26d65..758dcdd05 100644
--- a/packages/backend/src/misc/renote.ts
+++ b/packages/backend/src/misc/renote.ts
@@ -1,5 +1,5 @@
 import { Note } from '@/models/entities/note.js';
 
-export function isPureRenote(note: Note): boolean {
+export function isPureRenote(note: Note): note is Note & { renoteId: string, text: null, fileIds: null | never[], hasPoll: false } {
 	return note.renoteId != null && note.text == null && (note.fileIds == null || note.fileIds.length === 0) && !note.hasPoll;
 }
diff --git a/packages/backend/src/services/note/delete.ts b/packages/backend/src/services/note/delete.ts
index c36e6c46b..68c0a8d1c 100644
--- a/packages/backend/src/services/note/delete.ts
+++ b/packages/backend/src/services/note/delete.ts
@@ -43,11 +43,7 @@ export default async function(user: { id: User['id']; uri: User['uri']; host: Us
 
 			// if deleted note is renote
 			if (isPureRenote(note)) {
-				renote = await Notes.findOneBy({
-					// isPureRenote checks if note.renoteId is null already, so renoteId should be non-null.
-					// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-					id: note.renoteId!,
-				});
+				renote = await Notes.findOneBy({ id: note.renoteId });
 			}
 
 			const content = renderActivity(renote