diff --git a/packages/backend/src/core/FanoutTimelineService.ts b/packages/backend/src/core/FanoutTimelineService.ts
index 3d1f571066..b00814219b 100644
--- a/packages/backend/src/core/FanoutTimelineService.ts
+++ b/packages/backend/src/core/FanoutTimelineService.ts
@@ -113,17 +113,4 @@ export class FanoutTimelineService {
 	public purge(name: FanoutTimelineName) {
 		return this.redisForTimelines.del('list:' + name);
 	}
-
-	@bindThis
-	public purgeByUserIds(userIds: MiUser['id'][]) {
-		return Promise.all(userIds.flatMap(userId => [
-			this.purge(`homeTimeline:${userId}`),
-			this.purge(`homeTimelineWithFiles:${userId}`),
-			this.purge(`localTimelineWithReplyTo:${userId}`),
-			this.purge(`userTimeline:${userId}`),
-			this.purge(`userTimelineWithFiles:${userId}`),
-			this.purge(`userTimelineWithReplies:${userId}`),
-			this.purge(`userTimelineWithChannel:${userId}`),
-		]));
-	}
 }