diff --git a/packages/frontend/src/pages/settings/sounds.sound.vue b/packages/frontend/src/pages/settings/sounds.sound.vue
index 54e23d9852..2f4cd1be2c 100644
--- a/packages/frontend/src/pages/settings/sounds.sound.vue
+++ b/packages/frontend/src/pages/settings/sounds.sound.vue
@@ -9,7 +9,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<template #label>{{ i18n.ts.sound }}</template>
 		<option v-for="x in soundsTypes" :key="x ?? 'null'" :value="x">{{ getSoundTypeName(x) }}</option>
 	</MkSelect>
-	<div v-if="type === 'driveFile'" :class="$style.fileSelectorRoot">
+	<div v-if="type === '_driveFile_'" :class="$style.fileSelectorRoot">
 		<MkButton :class="$style.fileSelectorButton" inline rounded primary @click="selectSound">{{ i18n.ts.selectFile }}</MkButton>
 		<div :class="['_nowrap', !fileUrl && $style.fileNotSelected]">{{ friendlyFileName }}</div>
 	</div>
@@ -52,7 +52,7 @@ const fileUrl = ref(props.fileUrl);
 const fileName = ref<string>('');
 const volume = ref(props.volume);
 
-if (type.value === 'driveFile' && fileId.value) {
+if (type.value === '_driveFile_' && fileId.value) {
 	const apiRes = await os.api('drive/files/show', {
 		fileId: fileId.value,
 	});
@@ -63,7 +63,7 @@ function getSoundTypeName(f: SoundType): string {
 	switch (f) {
 		case null:
 			return i18n.ts.none;
-		case 'driveFile':
+		case '_driveFile_':
 			return i18n.ts._soundSettings.driveFile;
 		default:
 			return f;
@@ -110,7 +110,7 @@ function selectSound(ev) {
 }
 
 function listen() {
-	if (type.value === 'driveFile' && (!fileUrl.value || !fileId.value)) {
+	if (type.value === '_driveFile_' && (!fileUrl.value || !fileId.value)) {
 		os.alert({
 			type: 'warning',
 			text: i18n.ts._soundSettings.driveFileWarn,
@@ -118,8 +118,8 @@ function listen() {
 		return;
 	}
 
-	playFile(type.value === 'driveFile' ? {
-		type: 'driveFile',
+	playFile(type.value === '_driveFile_' ? {
+		type: '_driveFile_',
 		fileId: fileId.value as string,
 		fileUrl: fileUrl.value as string,
 		volume: volume.value,
@@ -130,7 +130,7 @@ function listen() {
 }
 
 function save() {
-	if (type.value === 'driveFile' && !fileUrl.value) {
+	if (type.value === '_driveFile_' && !fileUrl.value) {
 		os.alert({
 			type: 'warning',
 			text: i18n.ts._soundSettings.driveFileWarn,
@@ -138,7 +138,7 @@ function save() {
 		return;
 	}
 
-	if (type.value !== 'driveFile') {
+	if (type.value !== '_driveFile_') {
 		fileUrl.value = undefined;
 		fileName.value = '';
 		fileId.value = undefined;
diff --git a/packages/frontend/src/pages/settings/sounds.vue b/packages/frontend/src/pages/settings/sounds.vue
index 919da076eb..e549901f05 100644
--- a/packages/frontend/src/pages/settings/sounds.vue
+++ b/packages/frontend/src/pages/settings/sounds.vue
@@ -63,7 +63,7 @@ function getSoundTypeName(f: SoundType): string {
 	switch (f) {
 		case null:
 			return i18n.ts.none;
-		case 'driveFile':
+		case '_driveFile_':
 			return i18n.ts._soundSettings.driveFile;
 		default:
 			return f;
diff --git a/packages/frontend/src/scripts/sound.ts b/packages/frontend/src/scripts/sound.ts
index 2218d69d21..a4c6967d18 100644
--- a/packages/frontend/src/scripts/sound.ts
+++ b/packages/frontend/src/scripts/sound.ts
@@ -16,7 +16,7 @@ export const soundsTypes = [
 	null,
 
 	// ドライブの音声
-	'driveFile',
+	'_driveFile_',
 
 	// プリインストール
 	'syuilo/n-aec',
@@ -95,7 +95,7 @@ export type OperationType = typeof operationTypes[number];
 export async function loadAudio(soundStore: SoundStore, options?: { useCache?: boolean; }) {
 	if (_DEV_) console.log('loading audio. opts:', options);
 	// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
-	if (soundStore.type === null || (soundStore.type === 'driveFile' && !soundStore.fileUrl)) {
+	if (soundStore.type === null || (soundStore.type === '_driveFile_' && !soundStore.fileUrl)) {
 		return;
 	}
 	// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
@@ -103,7 +103,7 @@ export async function loadAudio(soundStore: SoundStore, options?: { useCache?: b
 		ctx = new AudioContext();
 	}
 	if (options?.useCache ?? true) {
-		if (soundStore.type === 'driveFile' && cache.has(soundStore.fileId)) {
+		if (soundStore.type === '_driveFile_' && cache.has(soundStore.fileId)) {
 			if (_DEV_) console.log('use cache');
 			return cache.get(soundStore.fileId) as AudioBuffer;
 		} else if (cache.has(soundStore.type)) {
@@ -114,7 +114,7 @@ export async function loadAudio(soundStore: SoundStore, options?: { useCache?: b
 
 	let response: Response;
 
-	if (soundStore.type === 'driveFile') {
+	if (soundStore.type === '_driveFile_') {
 		try {
 			response = await fetch(soundStore.fileUrl);
 		} catch (err) {
@@ -141,7 +141,7 @@ export async function loadAudio(soundStore: SoundStore, options?: { useCache?: b
 	const audioBuffer = await ctx.decodeAudioData(arrayBuffer);
 
 	if (options?.useCache ?? true) {
-		if (soundStore.type === 'driveFile') {
+		if (soundStore.type === '_driveFile_') {
 			cache.set(soundStore.fileId, audioBuffer);
 		} else {
 			cache.set(soundStore.type, audioBuffer);
diff --git a/packages/frontend/src/store.ts b/packages/frontend/src/store.ts
index f56454e114..70d2cf402d 100644
--- a/packages/frontend/src/store.ts
+++ b/packages/frontend/src/store.ts
@@ -38,17 +38,17 @@ interface PageViewInterruptor {
 
 /** サウンド設定 */
 export type SoundStore = {
-	type: Exclude<SoundType, 'driveFile'>;
+	type: Exclude<SoundType, '_driveFile_'>;
 	volume: number;
 } | {
-	type: 'driveFile';
+	type: '_driveFile_';
 
 	/** ドライブのファイルID */
 	fileId: string;
 
 	/** ファイルURL（こちらが優先される） */
 	fileUrl: string;
-	
+
 	volume: number;
 }