diff --git a/packages/backend/src/core/MfmService.ts b/packages/backend/src/core/MfmService.ts
index fe677a3b21..42676d6f98 100644
--- a/packages/backend/src/core/MfmService.ts
+++ b/packages/backend/src/core/MfmService.ts
@@ -413,7 +413,9 @@ export class MfmService {
 				const a = doc.createElement('a');
 				const { username, host, acct } = node.props;
 				const remoteUserInfo = mentionedRemoteUsers.find(remoteUser => remoteUser.username.toLowerCase() === username.toLowerCase() && remoteUser.host?.toLowerCase() === host?.toLowerCase());
-				a.setAttribute('href', remoteUserInfo ? (remoteUserInfo.url ? remoteUserInfo.url : remoteUserInfo.uri) : `${this.config.url}/${acct}`);
+				a.setAttribute('href', remoteUserInfo
+					? (remoteUserInfo.url ? remoteUserInfo.url : remoteUserInfo.uri)
+					: `${this.config.url}/${acct.endsWith(`@${this.config.url}`) ? acct.substring(0, acct.length - this.config.url.length - 1) : acct}`);
 				a.className = 'u-url mention';
 				a.textContent = acct;
 				return a;
diff --git a/packages/backend/src/core/activitypub/ApRendererService.ts b/packages/backend/src/core/activitypub/ApRendererService.ts
index 9e4ccc7019..0c68d9a067 100644
--- a/packages/backend/src/core/activitypub/ApRendererService.ts
+++ b/packages/backend/src/core/activitypub/ApRendererService.ts
@@ -420,7 +420,7 @@ export class ApRendererService {
 
 		const summary = note.cw === '' ? String.fromCharCode(0x200B) : note.cw;
 
-		const { content, noMisskeyContent } = this.apMfmService.getNoteHtml(note, apAppend);
+		const { content } = this.apMfmService.getNoteHtml(note, apAppend);
 
 		const emojis = await this.getEmojis(note.emojis);
 		const apemojis = emojis.filter(emoji => !emoji.localOnly).map(emoji => this.renderEmoji(emoji));
@@ -450,13 +450,11 @@ export class ApRendererService {
 			attributedTo,
 			summary: summary ?? undefined,
 			content: content ?? undefined,
-			...(noMisskeyContent ? {} : {
-				_misskey_content: text,
-				source: {
-					content: text,
-					mediaType: 'text/x.misskeymarkdown',
-				},
-			}),
+			_misskey_content: text,
+			source: {
+				content: text,
+				mediaType: 'text/x.misskeymarkdown',
+			},
 			_misskey_quote: quote,
 			quoteUrl: quote,
 			quoteUri: quote,