diff --git a/apps/guides/apps/web/src/lib/i18n/index.ts b/apps/guides/apps/web/src/lib/i18n/index.ts
index 0975aa46f..f5f61159d 100644
--- a/apps/guides/apps/web/src/lib/i18n/index.ts
+++ b/apps/guides/apps/web/src/lib/i18n/index.ts
@@ -3,6 +3,9 @@ import { addMessages, init, getLocaleFromNavigator } from 'svelte-i18n';
 import de from './locales/de.json';
 import en from './locales/en.json';
 
+export const supportedLocales = ['de', 'en'] as const;
+export type SupportedLocale = (typeof supportedLocales)[number];
+
 const LOCALE_KEY = 'guides_locale';
 
 addMessages('de', de);
@@ -16,7 +19,7 @@ init({
 	initialLocale: locale.startsWith('de') ? 'de' : 'en',
 });
 
-export function setLocale(lang: 'de' | 'en') {
+export function setLocale(lang: SupportedLocale) {
 	if (typeof localStorage !== 'undefined') {
 		localStorage.setItem(LOCALE_KEY, lang);
 	}