diff --git a/doc/configuration.rst b/doc/configuration.rst
index a439e18c..97d5a497 100644
--- a/doc/configuration.rst
+++ b/doc/configuration.rst
@@ -215,7 +215,7 @@ Attributes are rendered using jinja2, and can use a ``user`` variable.
     *Optional.* Defaults to ``{{ user.displayName[0] }}``
 
 :LOCALE:
-    *Optional.* Defaults to ``{{ user.preferredLanguage[0] }}``
+    *Optional.* Defaults to ``{{ user.preferredLanguage }}``
 
 :ADDRESS:
     *Optional.* Defaults to ``{{ user.postalAddress[0] }}``
diff --git a/tests/oidc/test_userinfo.py b/tests/oidc/test_userinfo.py
index 71795943..fd13e544 100644
--- a/tests/oidc/test_userinfo.py
+++ b/tests/oidc/test_userinfo.py
@@ -266,7 +266,7 @@ DEFAULT_JWT_MAPPING_CONFIG = {
     "GIVEN_NAME": "{{ user.givenName[0] }}",
     "FAMILY_NAME": "{{ user.sn[0] }}",
     "PREFERRED_USERNAME": "{{ user.displayName }}",
-    "LOCALE": "{{ user.preferredLanguage[0] }}",
+    "LOCALE": "{{ user.preferredLanguage }}",
 }