diff --git a/packages/frontend/src/components/MkRolePreview.vue b/packages/frontend/src/components/MkRolePreview.vue
index 3f14c5b5e0..15149b3f0c 100644
--- a/packages/frontend/src/components/MkRolePreview.vue
+++ b/packages/frontend/src/components/MkRolePreview.vue
@@ -41,7 +41,7 @@ import { i18n } from '@/i18n.js';
 const props = withDefaults(defineProps<{
 	role: Misskey.entities.Role;
 	forModeration: boolean;
-	detailed: boolean;
+	detailed?: boolean;
 }>(), {
 	detailed: true,
 });