diff --git a/app/Transformers/TaskTransformer.php b/app/Transformers/TaskTransformer.php
index d2080b6a4500..60949c0b1609 100644
--- a/app/Transformers/TaskTransformer.php
+++ b/app/Transformers/TaskTransformer.php
@@ -130,6 +130,7 @@ class TaskTransformer extends EntityTransformer
             'status_sort_order' => (int) $task->status_sort_order, //deprecated 5.0.34
             'is_date_based' => (bool) $task->is_date_based,
             'status_order' => is_null($task->status_order) ? null : (int) $task->status_order,
+            'calculated_start_date' => $task->calculated_start_date ?: '',
         ];
     }
 }