diff --git a/src/routes/settings.tsx b/src/routes/settings.tsx
index a2cdd10..43efb2f 100644
--- a/src/routes/settings.tsx
+++ b/src/routes/settings.tsx
@@ -79,6 +79,7 @@ export default function SettingsPage() {
         defaultValues: config
             ? {
                 ...config,
+                language: config.language.replace('_', '-'),
                 site_name: config.site_name || "",
                 user_template:
                     config.user_template ||