diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4c4ae2ae3..a87de8f66 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -39,6 +39,7 @@
 - Fix: ActivityPub: 追加情報のカスタム絵文字がユーザー情報のtagに含まれない問題を修正
 - Fix: ActivityPubに関するセキュリティの向上
 - Fix: 非公開の投稿に対して返信できないように
+- Fix: LTLに特定条件下にてチャンネルへの投稿が混ざり込む現象を修正
 
 ## 2023.11.0
 
diff --git a/packages/backend/src/server/api/endpoints/notes/local-timeline.ts b/packages/backend/src/server/api/endpoints/notes/local-timeline.ts
index 003dae661..79baa6b28 100644
--- a/packages/backend/src/server/api/endpoints/notes/local-timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/local-timeline.ts
@@ -186,7 +186,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 	}, me: MiLocalUser | null) {
 		const query = this.queryService.makePaginationQuery(this.notesRepository.createQueryBuilder('note'),
 			ps.sinceId, ps.untilId)
-			.andWhere('(note.visibility = \'public\') AND (note.userHost IS NULL)')
+			.andWhere('(note.visibility = \'public\') AND (note.userHost IS NULL) AND (note.channelId IS NULL)')
 			.innerJoinAndSelect('note.user', 'user')
 			.leftJoinAndSelect('note.reply', 'reply')
 			.leftJoinAndSelect('note.renote', 'renote')
diff --git a/packages/backend/src/server/api/stream/channels/local-timeline.ts b/packages/backend/src/server/api/stream/channels/local-timeline.ts
index 9dd05b9b0..1388f186f 100644
--- a/packages/backend/src/server/api/stream/channels/local-timeline.ts
+++ b/packages/backend/src/server/api/stream/channels/local-timeline.ts
@@ -52,7 +52,7 @@ class LocalTimelineChannel extends Channel {
 
 		if (note.user.host !== null) return;
 		if (note.visibility !== 'public') return;
-		if (note.channelId != null && !this.followingChannels.has(note.channelId)) return;
+		if (note.channelId != null) return;
 
 		// 関係ない返信は除外
 		if (note.reply && this.user && !this.following[note.userId]?.withReplies && !this.withReplies) {