diff --git a/koha-tmpl/intranet-tmpl/prog/en/modules/acqui/basket.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/acqui/basket.tt
index 2187416e46..6fb448ceb1 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/acqui/basket.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/acqui/basket.tt
@@ -138,7 +138,7 @@
         } else {
             ids = new Array;
         }
-        if (ids.indexOf(borrowernumber) < 0) {
+        if (ids.indexOf(borrowernumber.toString()) < 0) {
             ids.push(borrowernumber);
             $("#users_ids").val(ids.join(':'));
             var li = '<li id="user_'+borrowernumber+'">'+borrowername