diff --git a/src/pretix/base/i18n.py b/src/pretix/base/i18n.py
index 4aeb19a33..25ebd8c01 100644
--- a/src/pretix/base/i18n.py
+++ b/src/pretix/base/i18n.py
@@ -141,7 +141,7 @@ def get_babel_locale():
 
     for locale in try_locales:
         if localedata.exists(locale):
-            return locale
+            return localedata.normalize_locale(locale)
 
     return "en"
 
diff --git a/src/tests/helpers/test_i18n.py b/src/tests/helpers/test_i18n.py
index 0726af70d..823e8c7ad 100644
--- a/src/tests/helpers/test_i18n.py
+++ b/src/tests/helpers/test_i18n.py
@@ -59,6 +59,7 @@ def test_get_locale():
         ("pt-pt", "PT", "pt-pt", "pt-pt", "pt_PT"),
         ("es", "MX", "es-mx", "es", "es_MX"),
         ("es-419", "MX", "es-419", "es-419", "es_MX"),
+        ("zh-hans", "US", "zh-hans", "zh-hans", "zh_Hans"),
         ("zh-hans", "CN", "zh-hans", "zh-hans", "zh_Hans_CN"),
         ("zh-hant", "TW", "zh-hant", "zh-hant", "zh_Hant_TW"),
     ],