diff --git a/lemonldap-ng-common/lib/Lemonldap/NG/Common/Conf/Serializer.pm b/lemonldap-ng-common/lib/Lemonldap/NG/Common/Conf/Serializer.pm
index c1e198091..2ba89522a 100644
--- a/lemonldap-ng-common/lib/Lemonldap/NG/Common/Conf/Serializer.pm
+++ b/lemonldap-ng-common/lib/Lemonldap/NG/Common/Conf/Serializer.pm
@@ -72,7 +72,7 @@ sub serialize {
 
         # 1.Hash ref
         if ( ref($v) ) {
-            $fields->{$k} = JSON->encode($v);
+            $fields->{$k} = to_json($v);
         }
         else {
             $fields->{$k} = $v;