diff --git a/addons/web_kanban/static/src/js/kanban.js b/addons/web_kanban/static/src/js/kanban.js
index 398d65d17ce..357fa049d5f 100644
--- a/addons/web_kanban/static/src/js/kanban.js
+++ b/addons/web_kanban/static/src/js/kanban.js
@@ -642,13 +642,12 @@ instance.web_kanban.KanbanGroup = instance.web.Widget.extend({
     },
     do_show_more: function(evt) {
         var self = this;
+        var ids = self.view.dataset.ids.splice(0);
         return this.dataset.read_slice(this.view.fields_keys.concat(['__last_update']), {
             'limit': self.view.limit,
             'offset': self.dataset_offset += self.view.limit
         }).then(function(records) {
-            records.forEach(function(r) {
-                self.view.dataset.ids.push(r.id);
-            });
+            self.view.dataset.ids = self.view.dataset.ids.concat(ids);
             self.do_add_records(records);
             return records;
         });