diff --git a/packages/devextreme/js/__internal/scheduler/workspaces/view_model/m_view_data_generator_month.ts b/packages/devextreme/js/__internal/scheduler/workspaces/view_model/m_view_data_generator_month.ts
index 15b5de03459f..dd4c385c0f3d 100644
--- a/packages/devextreme/js/__internal/scheduler/workspaces/view_model/m_view_data_generator_month.ts
+++ b/packages/devextreme/js/__internal/scheduler/workspaces/view_model/m_view_data_generator_month.ts
@@ -20,7 +20,7 @@ export class ViewDataGeneratorMonth extends ViewDataGenerator {
 
   _maxVisibleDate: any;
 
-  tableAllDay = false;
+  tableAllDay: any = undefined;
 
   // eslint-disable-next-line @typescript-eslint/no-unused-vars
   getCellData(rowIndex, columnIndex, options, allDay) {
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets.scheduler/tableCreator.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets.scheduler/tableCreator.tests.js
index b7736bc97a11..6b6386fd2501 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets.scheduler/tableCreator.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets.scheduler/tableCreator.tests.js
@@ -1,4 +1,6 @@
-import { tableCreator } from '__internal/scheduler/m_table_creator';
+import tableCreatorModule from '__internal/scheduler/m_table_creator';
+
+const { tableCreator } = tableCreatorModule;
 
 const FIXTURE_DATA = [{
     title: 'o1',