diff --git a/lib/timeline/component/ItemSet.js b/lib/timeline/component/ItemSet.js
index 28d610f5..d3f670fe 100644
--- a/lib/timeline/component/ItemSet.js
+++ b/lib/timeline/component/ItemSet.js
@@ -1157,7 +1157,8 @@ ItemSet.prototype._orderNestedGroups = function(groupIds) {
       var nestedGroups = this.groupsData.get({
         filter: function(nestedGroup) {
           return nestedGroup.nestedInGroup == groupId;
-        }
+        },
+        order: this.options.groupOrder
       });
       var nestedGroupIds = nestedGroups.map(function(nestedGroup) { return nestedGroup.id })
       newGroupIdsOrder = newGroupIdsOrder.concat(nestedGroupIds);