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 90163c5ec27..1e669824ec8 100644
--- a/addons/web/static/src/js/views/pivot/pivot_model.js
+++ b/addons/web/static/src/js/views/pivot/pivot_model.js
@@ -599,14 +599,14 @@ var PivotModel = AbstractModel.extend({
         });
 
         var index = 0;
-        var rowGroupBys = !_.isEmpty(this.data.groupedBy) ? this.data.groupedBy : this.initialRowGroupBys;
+        var rowGroupBys = !_.isEmpty(this.data.groupedBy) ? this.data.groupedBy : this.initialRowGroupBys.slice();
+        this.data.groupedBy = rowGroupBys;
         var colGroupBys = this.data.colGroupBys;
         var datapt, row, col, attrs, cell_value;
         var main_row_header, main_col_header;
         var groupBys;
         var m;
 
-
         for (var i = 0; i < rowGroupBys.length + 1; i++) {
             for (var j = 0; j < colGroupBys.length + 1; j++) {
                 for (var k = 0; k < data[index].length; k++) {
@@ -721,8 +721,8 @@ var PivotModel = AbstractModel.extend({
      */
     _updateMainGroupBys: function (old, main) {
         var new_groupby_length = this._getHeaderDepth(main.root) - 1;
-        var new_groupby_list = old.root.groupbys.slice(0, new_groupby_length);
-        main.root.groupbys = new_groupby_list;
+        main.root.groupbys = old.root.groupbys;
+        main.root.groupbys.splice(new_groupby_length);
     },
     /**
      * @param {Object} old_tree
diff --git a/addons/web/static/tests/views/pivot_tests.js b/addons/web/static/tests/views/pivot_tests.js
index 2c22b5dcf50..1eb9fa94e30 100644
--- a/addons/web/static/tests/views/pivot_tests.js
+++ b/addons/web/static/tests/views/pivot_tests.js
@@ -988,6 +988,48 @@ QUnit.module('Views', {
         pivot.destroy();
     });
 
+    QUnit.test('Reload, group by columns, reload', function (assert) {
+        assert.expect(2);
+
+        var pivot = createView({
+            View: PivotView,
+            model: "partner",
+            data: this.data,
+            arch: '<pivot/>',
+        });
+
+        // Set a column groupby
+        pivot.$('thead .o_pivot_header_cell_closed').click();
+        pivot.$('.o_field_selection li[data-field=customer] a').click();
+
+        // Set a domain
+        pivot.update({domain: [['product_id', '=', 41]]});
+
+        var expectedContext = {pivot_column_groupby: ['customer'],
+                               pivot_measures: ['__count'],
+                               pivot_row_groupby: []};
+
+        // Check that column groupbys were not lost
+        assert.deepEqual(pivot.getContext(), expectedContext,
+            'Column groupby not lost after first reload');
+
+        // Set a column groupby
+        pivot.$('thead .o_pivot_header_cell_closed').click();
+        pivot.$('.o_field_selection li[data-field=product_id] a').click();
+
+        // Set a domain
+        pivot.update({domain: [['product_id', '=', 37]]});
+
+        var expectedContext = {pivot_column_groupby: ['customer', 'product_id'],
+                               pivot_measures: ['__count'],
+                               pivot_row_groupby: []};
+
+        assert.deepEqual(pivot.getContext(), expectedContext,
+            'Column groupby not lost after second reload');
+
+        pivot.destroy();
+    });
+
     QUnit.test('correctly uses pivot_ keys from the context', function (assert) {
         assert.expect(7);