diff --git a/module/task/model.php b/module/task/model.php
index e2fa5cc836..74205b959c 100644
--- a/module/task/model.php
+++ b/module/task/model.php
@@ -51,7 +51,7 @@ class taskModel extends model
             /* Check duplicate task. */
             if($task->type != 'affair')
             {
-                $result = $this->loadModel('common')->removeDuplicate('task', $task, "project=$projectID");
+                $result = $this->loadModel('common')->removeDuplicate('task', $task, "project=$projectID and story=$task->story");
                 if($result['stop'])
                 {
                     $tasksID[$assignedTo] = array('status' => 'exists', 'id' => $result['duplicate']);