diff --git a/quartz/i18n/index.ts b/quartz/i18n/index.ts
index 69a18c9..9e14ffe 100644
--- a/quartz/i18n/index.ts
+++ b/quartz/i18n/index.ts
@@ -13,5 +13,5 @@ export const TRANSLATIONS = {
   "nl-NL": nl,
 } as const
 
-export const i18n = (locale: ValidLocale): Translation => TRANSLATIONS[locale]
+export const i18n = (locale: ValidLocale): Translation => TRANSLATIONS[locale ?? "en-US"]
 export type ValidLocale = keyof typeof TRANSLATIONS