diff --git a/packages/frontend/src/components/MkPostForm.vue b/packages/frontend/src/components/MkPostForm.vue
index 5f4e40d513..59c23b090e 100644
--- a/packages/frontend/src/components/MkPostForm.vue
+++ b/packages/frontend/src/components/MkPostForm.vue
@@ -316,20 +316,8 @@ if (props.reply && (props.reply.user.username !== $i.username || (props.reply.us
 	text.value = `@${props.reply.user.username}${props.reply.user.host != null ? '@' + toASCII(props.reply.user.host) : ''} `;
 }
 
-if (props.reply && props.reply.text != null) {
-	const ast = mfm.parse(props.reply.text);
-	const otherHost = props.reply.user.host;
-
-	for (const x of extractMentions(ast)) {
-		const mention = x.host ?
-			`@${x.username}@${toASCII(x.host)}` :
-			(otherHost == null || otherHost === host) ?
-				`@${x.username}` :
-				`@${x.username}@${toASCII(otherHost)}`;
-
-		// 自分は除外
-		if ($i.username === x.username && (x.host == null || x.host === host)) continue;
-
+if (props.reply && props.reply.mentionHandles) {
+	for (const mention of Object.values(props.reply.mentionHandles)) {
 		// 重複は除外
 		if (text.value.includes(`${mention} `)) continue;