diff --git a/apps/files/src/components/FileEntry/FileEntryName.vue b/apps/files/src/components/FileEntry/FileEntryName.vue
index 5411d8657b99a..8289df1f95850 100644
--- a/apps/files/src/components/FileEntry/FileEntryName.vue
+++ b/apps/files/src/components/FileEntry/FileEntryName.vue
@@ -71,7 +71,7 @@ import { useNavigation } from '../../composables/useNavigation'
 import { useRenamingStore } from '../../store/renaming.ts'
 import logger from '../../logger.js'
 
-const forbiddenCharacters = loadState('files', 'forbiddenCharacters', '') as string
+const forbiddenCharacters = loadState<string>('files', 'forbiddenCharacters', '').split('')
 
 export default Vue.extend({
 	name: 'FileEntryName',
diff --git a/apps/files/src/components/NewNodeDialog.vue b/apps/files/src/components/NewNodeDialog.vue
index 46c39890dc987..0f6a739d21c1b 100644
--- a/apps/files/src/components/NewNodeDialog.vue
+++ b/apps/files/src/components/NewNodeDialog.vue
@@ -61,7 +61,7 @@ interface ICanFocus {
 	focus: () => void
 }
 
-const forbiddenCharacters = loadState<string[]>('files', 'forbiddenCharacters', [])
+const forbiddenCharacters = loadState<string>('files', 'forbiddenCharacters', '').split('')
 
 export default defineComponent({
 	name: 'NewNodeDialog',