diff --git a/frontend/src/views/project/helpers/useGanttFilters.ts b/frontend/src/views/project/helpers/useGanttFilters.ts
index edb3cdf04..1877ab9fd 100644
--- a/frontend/src/views/project/helpers/useGanttFilters.ts
+++ b/frontend/src/views/project/helpers/useGanttFilters.ts
@@ -100,6 +100,7 @@ function ganttFiltersToApiParams(filters: GanttFilters): TaskFilterParams {
 			'(start_date <= "' + dateFrom + '" && end_date >= "' + dateTo + '")' +
 			')',
 		filter_include_nulls: filters.showTasksWithoutDates,
+		expand: 'subtasks',
 	}
 }