diff --git a/packages/backend/src/misc/is-user-related.ts b/packages/backend/src/misc/is-user-related.ts
index e6bbdb5d35..a1811c3ce3 100644
--- a/packages/backend/src/misc/is-user-related.ts
+++ b/packages/backend/src/misc/is-user-related.ts
@@ -1,15 +1,7 @@
-export function isUserRelated(note: any, userIds: Set<string>): boolean {
-	if (userIds.has(note.userId)) {
-		return true;
-	}
-
-	if (note.reply != null && userIds.has(note.reply.userId)) {
-		return true;
-	}
-
-	if (note.renote != null && userIds.has(note.renote.userId)) {
-		return true;
-	}
-
+export function isUserRelated(note: any, ids: Set<string>): boolean {
+	if(ids.has(note.userId)) return true; // note author is muted
+	if(note.mentions && note.mentions.some((user: string) => ids.has(user))) return true; // any of mentioned users are muted
+	if(note.reply  && isUserRelated(note.reply, ids))  return true; // also check reply target
+	if(note.renote && isUserRelated(note.renote, ids)) return true; // also check renote target
 	return false;
 }