diff --git a/koha-tmpl/opac-tmpl/bootstrap/js/datatables.js b/koha-tmpl/opac-tmpl/bootstrap/js/datatables.js
index e924691538..2badc80b3d 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/js/datatables.js
+++ b/koha-tmpl/opac-tmpl/bootstrap/js/datatables.js
@@ -601,8 +601,8 @@ function _dt_visibility(table_settings, table_dt) {
             if (options.ajax && !options.bKohaAjaxSVC) {
                 options.ajax = Object.assign(
                     {},
-                    options.ajax,
-                    _dt_default_ajax({ default_filters, options })
+                    _dt_default_ajax({ default_filters, options }),
+                    options.ajax
                 );
                 options.serverSide = true;
                 options.processing = true;