diff --git a/koha-tmpl/intranet-tmpl/prog/en/modules/catalogue/itemsearch.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/catalogue/itemsearch.tt
index 0ae9bd5fe7..89006963d5 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/catalogue/itemsearch.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/catalogue/itemsearch.tt
@@ -461,7 +461,10 @@
                     type: 'POST',
                     data: function ( d ) {
                         for (i in params) {
-                            d[params[i].name] = params[i].value;
+                            if (! d.hasOwnProperty(params[i].name) ) {
+                                d[params[i].name] = [];
+                            }
+                            d[params[i].name].push(params[i].value);
                         }
                         d.format = 'json';
                         d.columns = JSON.stringify( d.columns );