diff --git a/lemonldap-ng-manager/lib/Lemonldap/NG/Manager/Build/Attributes.pm b/lemonldap-ng-manager/lib/Lemonldap/NG/Manager/Build/Attributes.pm
index 9d1ae4794..428321e37 100644
--- a/lemonldap-ng-manager/lib/Lemonldap/NG/Manager/Build/Attributes.pm
+++ b/lemonldap-ng-manager/lib/Lemonldap/NG/Manager/Build/Attributes.pm
@@ -2229,7 +2229,7 @@ m{^(?:ldapi://[^/]*/?|\w[\w\-\.]*(?::\d{1,5})?|ldap(?:s|\+tls)?://\w[\w\-\.]*(?:
         # Null
         nullAuthnLevel => {
             type          => 'int',
-            default       => 2,
+            default       => 0,
             documentation => 'Null authentication level',
         },