diff --git a/addons/web/static/src/js/views/pivot/pivot_model.js b/addons/web/static/src/js/views/pivot/pivot_model.js
index 763bd47d624..d00f75f5079 100644
--- a/addons/web/static/src/js/views/pivot/pivot_model.js
+++ b/addons/web/static/src/js/views/pivot/pivot_model.js
@@ -511,9 +511,11 @@ var PivotModel = AbstractModel.extend({
             origins: this.data.origins,
             rowGroupBys: groupBys.rowGroupBys,
             selectionGroupBys: this._getSelectionGroupBy(groupBys),
+            modelName: this.modelName
         };
         if (!raw && state.hasData) {
             state.table = this._getTable();
+            state.tree = this.rowGroupTree;
         }
         return state;
     },