diff --git a/packages/frontend/src/components/MkWindow.vue b/packages/frontend/src/components/MkWindow.vue
index a5f7a2e9e5..056b6a37ed 100644
--- a/packages/frontend/src/components/MkWindow.vue
+++ b/packages/frontend/src/components/MkWindow.vue
@@ -54,9 +54,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <script lang="ts" setup>
 import { onBeforeUnmount, onMounted, provide, shallowRef, ref } from 'vue';
+import type { MenuItem } from '@/types/menu.js';
 import contains from '@/scripts/contains.js';
 import * as os from '@/os.js';
-import type { MenuItem } from '@/types/menu.js';
 import { i18n } from '@/i18n.js';
 import { defaultStore } from '@/store.js';
 
@@ -484,6 +484,10 @@ defineExpose({
 }
 
 .root {
+	// universal.vueとかで直接--MI-stickyBottomが定義されていたりするのでリセット
+	--MI-stickyTop: 0;
+	--MI-stickyBottom: 0;
+
 	position: fixed;
 	top: 0;
 	left: 0;