diff --git a/packages/backend/src/misc/is-quote.ts b/packages/backend/src/misc/is-quote.ts
deleted file mode 100644
index 779f548b0..000000000
--- a/packages/backend/src/misc/is-quote.ts
+++ /dev/null
@@ -1,5 +0,0 @@
-import { Note } from '@/models/entities/note.js';
-
-export default function(note: Note): boolean {
-	return note.renoteId != null && (note.text != null || note.hasPoll || (note.fileIds != null && note.fileIds.length > 0));
-}
diff --git a/packages/backend/src/misc/renote.ts b/packages/backend/src/misc/renote.ts
new file mode 100644
index 000000000..e4b8c06e1
--- /dev/null
+++ b/packages/backend/src/misc/renote.ts
@@ -0,0 +1,5 @@
+import { Note } from '@/models/entities/note.js';
+
+export function isPureRenote(note: Note): boolean {
+	return note.renoteId != null && note.text == null && (renote.fileIds == null || renote.fileIds.length === 0) && !note.hasPoll;
+}
diff --git a/packages/backend/src/server/activitypub/outbox.ts b/packages/backend/src/server/activitypub/outbox.ts
index 7a2586998..feefff227 100644
--- a/packages/backend/src/server/activitypub/outbox.ts
+++ b/packages/backend/src/server/activitypub/outbox.ts
@@ -13,6 +13,7 @@ import { Users, Notes } from '@/models/index.js';
 import { Note } from '@/models/entities/note.js';
 import { makePaginationQuery } from '../api/common/make-pagination-query.js';
 import { setResponseType } from '../activitypub.js';
+import { isPureRenote } from '@/misc/renote.js';
 
 export default async (ctx: Router.RouterContext) => {
 	const userId = ctx.params.user;
@@ -99,10 +100,10 @@ export default async (ctx: Router.RouterContext) => {
  * @param note Note
  */
 export async function packActivity(note: Note): Promise<any> {
-	if (note.renoteId && note.text == null && !note.hasPoll && (note.fileIds == null || note.fileIds.length === 0)) {
+	if (isPureRenote(note)) {
 		const renote = await Notes.findOneByOrFail({ id: note.renoteId });
 		return renderAnnounce(renote.uri ? renote.uri : `${config.url}/notes/${renote.id}`, note);
+	} else {
+		return renderCreate(await renderNote(note, false), note);
 	}
-
-	return renderCreate(await renderNote(note, false), note);
 }
diff --git a/packages/backend/src/server/api/endpoints/notes/create.ts b/packages/backend/src/server/api/endpoints/notes/create.ts
index 2f3d47c12..38d2f9cef 100644
--- a/packages/backend/src/server/api/endpoints/notes/create.ts
+++ b/packages/backend/src/server/api/endpoints/notes/create.ts
@@ -10,6 +10,7 @@ import { noteVisibilities } from '../../../../types.js';
 import { ApiError } from '../../error.js';
 import define from '../../define.js';
 import { getNote } from '../../common/getters.js';
+import { isPureRenote } from '@/misc/renote.js';
 
 export const meta = {
 	tags: ['notes'],
@@ -201,7 +202,7 @@ export default define(meta, paramDef, async (ps, user) => {
 			throw e;
 		});
 
-		if (renote.renoteId && !renote.text && !renote.fileIds && !renote.hasPoll) {
+		if (isPureRenote(renote)) {
 			throw new ApiError(meta.errors.cannotReRenote);
 		}
 
@@ -230,7 +231,7 @@ export default define(meta, paramDef, async (ps, user) => {
 			throw e;
 		});
 
-		if (reply.renoteId && !reply.text && !reply.fileIds && !reply.hasPoll) {
+		if (isPureRenote(reply)) {
 			throw new ApiError(meta.errors.cannotReplyToPureRenote);
 		}
 
diff --git a/packages/backend/src/services/note/delete.ts b/packages/backend/src/services/note/delete.ts
index 496320016..54ba5c6cb 100644
--- a/packages/backend/src/services/note/delete.ts
+++ b/packages/backend/src/services/note/delete.ts
@@ -14,6 +14,7 @@ import { deliverToFollowers, deliverToUser } from '@/remote/activitypub/deliver-
 import { countSameRenotes } from '@/misc/count-same-renotes.js';
 import { registerOrFetchInstanceDoc } from '../register-or-fetch-instance-doc.js';
 import { deliverToRelays } from '../relay.js';
+import { isPureRenote } from '@/misc/renote.js';
 
 /**
  * 投稿を削除します。
@@ -43,7 +44,7 @@ export default async function(user: { id: User['id']; uri: User['uri']; host: Us
 			let renote: Note | null = null;
 
 			// if deletd note is renote
-			if (note.renoteId && note.text == null && !note.hasPoll && (note.fileIds == null || note.fileIds.length === 0)) {
+			if (isPureRenote(note)) {
 				renote = await Notes.findOneBy({
 					id: note.renoteId,
 				});