diff --git a/management/univention-directory-manager-modules/modules/univention/admin/handlers/settings/sambadomain.py b/management/univention-directory-manager-modules/modules/univention/admin/handlers/settings/sambadomain.py
index 99753a9..2df7d22 100644
--- a/management/univention-directory-manager-modules/modules/univention/admin/handlers/settings/sambadomain.py
+++ b/management/univention-directory-manager-modules/modules/univention/admin/handlers/settings/sambadomain.py
@@ -89,7 +89,7 @@ def logonToChangePWUnmap(val):
 		syntax=univention.admin.syntax.string,
 		multivalue=False,
 		options=[],
-		required=False,
+		required=True,
 		may_change=False,
 		default='',
 		identifies=False