diff --git a/dashboard/src/components/BackupSiteAddDialog.vue b/dashboard/src/components/BackupSiteAddDialog.vue
index 836ec4b32..35da2762a 100644
--- a/dashboard/src/components/BackupSiteAddDialog.vue
+++ b/dashboard/src/components/BackupSiteAddDialog.vue
@@ -237,7 +237,10 @@ defineExpose({
     enableForUpdates.value = false;
     provider.value = '';
     format.value = '';
-    providerConfig.value = {};
+    providerConfig.value = {
+      mountOptions: {},
+      prefix: '',
+    };
     useEncryption.value = false;
     encryptionPassword.value = '';
     encryptionPasswordRepeat.value = '';