diff --git a/apps/web/lib/i18n/i18n.server.ts b/apps/web/lib/i18n/i18n.server.ts
index c8b86c567..87b124066 100644
--- a/apps/web/lib/i18n/i18n.server.ts
+++ b/apps/web/lib/i18n/i18n.server.ts
@@ -58,6 +58,10 @@ export const createI18nServerInstance = cache(createInstance);
 function getPreferredLanguageFromBrowser() {
   const acceptLanguage = headers().get('accept-language');
 
+  if (!acceptLanguage) {
+    return;
+  }
+
   return parseAcceptLanguageHeader(acceptLanguage, languages)[0];
 }
 
diff --git a/packages/i18n/src/i18n.server.ts b/packages/i18n/src/i18n.server.ts
index 64385e13b..7bf1f201e 100644
--- a/packages/i18n/src/i18n.server.ts
+++ b/packages/i18n/src/i18n.server.ts
@@ -73,9 +73,15 @@ export function parseAcceptLanguageHeader(
       // Ignore wildcard '*' if 'ignoreWildcard' is true
       if (locale === '*' && ignoreWildcard) return [];
 
+      const languageSegment = locale.split('-')[0];
+
+      if (!languageSegment) return [];
+
       // Return the locale if it's included in the accepted languages
       try {
-        return acceptedLanguages.includes(locale) ? [locale] : [];
+        return acceptedLanguages.includes(languageSegment)
+          ? [languageSegment]
+          : [];
       } catch {
         return [];
       }