diff --git a/packages/ep_products/Classes/ContentFeed/ManifestBuilder.php b/packages/ep_products/Classes/ContentFeed/ManifestBuilder.php
index 621843b..20805e9 100644
--- a/packages/ep_products/Classes/ContentFeed/ManifestBuilder.php
+++ b/packages/ep_products/Classes/ContentFeed/ManifestBuilder.php
@@ -88,7 +88,7 @@ class ManifestBuilder
         $languages = [];
 
         foreach ($site->getLanguages() as $language) {
-            $languages[] = $language->getTwoLetterIsoCode();
+            $languages[] = $language->getLocale()->getLanguageCode();
         }
 
         $title = trim((string) ($site->getConfiguration()['websiteTitle'] ?? ''));
@@ -121,7 +121,7 @@ class ManifestBuilder
 
             foreach ($site->getLanguages() as $language) {
                 if (in_array($language->getLanguageId(), $feedLanguages, true)) {
-                    $languageIds[$language->getLanguageId()] = $language->getTwoLetterIsoCode();
+                    $languageIds[$language->getLanguageId()] = $language->getLocale()->getLanguageCode();
                 }
             }