diff --git a/packages/frontend/src/pages/settings/drive-cleaner.vue b/packages/frontend/src/pages/settings/drive-cleaner.vue
index b20774c4ec..8d2946db63 100644
--- a/packages/frontend/src/pages/settings/drive-cleaner.vue
+++ b/packages/frontend/src/pages/settings/drive-cleaner.vue
@@ -48,7 +48,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script setup lang="ts">
-import { computed, ref, watch } from 'vue';
+import { computed, ref, watch, type StyleValue } from 'vue';
 import tinycolor from 'tinycolor2';
 import * as os from '@/os.js';
 import { misskeyApi } from '@/scripts/misskey-api.js';
@@ -102,10 +102,10 @@ function fetchDriveInfo(): void {
 	});
 }
 
-function genUsageBar(fsize: number): object {
+function genUsageBar(fsize: number): StyleValue {
 	return {
 		width: `${fsize / usage.value * 100}%`,
-		background: tinycolor({ h: 180 - (fsize / usage.value * 180), s: 0.7, l: 0.5 }),
+		background: tinycolor({ h: 180 - (fsize / usage.value * 180), s: 0.7, l: 0.5 }).toHslString(),
 	};
 }
 
diff --git a/packages/frontend/src/pages/settings/drive.vue b/packages/frontend/src/pages/settings/drive.vue
index 81a8d474d2..0e66b93f1c 100644
--- a/packages/frontend/src/pages/settings/drive.vue
+++ b/packages/frontend/src/pages/settings/drive.vue
@@ -95,7 +95,7 @@ const meterStyle = computed(() => {
 			h: 180 - (usage.value / capacity.value * 180),
 			s: 0.7,
 			l: 0.5,
-		}),
+		}).toHslString(),
 	};
 });