diff --git a/packages/backend/src/core/activitypub/ApMfmService.ts b/packages/backend/src/core/activitypub/ApMfmService.ts
index ab75b9abbd..4036d2794a 100644
--- a/packages/backend/src/core/activitypub/ApMfmService.ts
+++ b/packages/backend/src/core/activitypub/ApMfmService.ts
@@ -25,7 +25,7 @@ export class ApMfmService {
 	}
 
 	@bindThis
-	public getNoteHtml(note: MiNote, apAppend?: string) {
+	public getNoteHtml(note: Pick<MiNote, 'text' | 'mentionedRemoteUsers'>, apAppend?: string) {
 		let noMisskeyContent = false;
 		const srcMfm = (note.text ?? '') + (apAppend ?? '');
 
diff --git a/packages/backend/test/unit/ApMfmService.ts b/packages/backend/test/unit/ApMfmService.ts
index 79cb81f5c9..e81a321c9b 100644
--- a/packages/backend/test/unit/ApMfmService.ts
+++ b/packages/backend/test/unit/ApMfmService.ts
@@ -23,10 +23,10 @@ describe('ApMfmService', () => {
 
 	describe('getNoteHtml', () => {
 		test('Do not provide _misskey_content for simple text', () => {
-			const note: MiNote = {
+			const note = {
 				text: 'テキスト #タグ @mention 🍊 :emoji: https://example.com',
 				mentionedRemoteUsers: '[]',
-			} as any;
+			};
 
 			const { content, noMisskeyContent } = apMfmService.getNoteHtml(note);
 
@@ -35,10 +35,10 @@ describe('ApMfmService', () => {
 		});
 
 		test('Provide _misskey_content for MFM', () => {
-			const note: MiNote = {
+			const note = {
 				text: '$[tada foo]',
 				mentionedRemoteUsers: '[]',
-			} as any;
+			};
 
 			const { content, noMisskeyContent } = apMfmService.getNoteHtml(note);