diff --git a/module/task/model.php b/module/task/model.php
index 5ba1677c31..9f5fad425e 100644
--- a/module/task/model.php
+++ b/module/task/model.php
@@ -4034,7 +4034,7 @@ class taskModel extends model
             $oldOrder = (int)$oldTask->order;
             if($order > $oldOrder)
             {
-                $this->dao->update(TABLE_TASK)->set('`order`')->eq('`order`-1')
+                $this->dao->update(TABLE_TASK)->set('`order`=`order`-1')
                     ->where('execution')->eq($executionID)
                     ->andWhere('`order`')->le($order)
                     ->andWhere('`order`')->gt($oldOrder)