diff --git a/packages/frontend/src/pages/admin/roles.vue b/packages/frontend/src/pages/admin/roles.vue
index ef6e25685d..70e8153544 100644
--- a/packages/frontend/src/pages/admin/roles.vue
+++ b/packages/frontend/src/pages/admin/roles.vue
@@ -149,7 +149,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					<MkFolder v-if="matchQuery([i18n.ts._role._options.uploadableFileTypes, 'uploadableFileTypes'])">
 						<template #label>{{ i18n.ts._role._options.uploadableFileTypes }}</template>
 						<template #suffix>...</template>
-						<MkTextarea :modelValue="policies.uploadableFileTypes.join('\n')">
+						<MkTextarea :modelValue="policies.uploadableFileTypes.join('\n')" @update:modelValue="v => policies.uploadableFileTypes = v.split('\n')">
 							<template #caption>
 								<div>{{ i18n.ts._role._options.uploadableFileTypes_caption }}</div>
 								<div><i class="ti ti-alert-triangle" style="color: var(--MI_THEME-warn);"></i> {{ i18n.tsx._role._options.uploadableFileTypes_caption2({ x: 'application/octet-stream' }) }}</div>