diff --git a/plugins/tasklist/drivers/kolab/tasklist_kolab_driver.php b/plugins/tasklist/drivers/kolab/tasklist_kolab_driver.php
index f9648e83..010be7bc 100644
--- a/plugins/tasklist/drivers/kolab/tasklist_kolab_driver.php
+++ b/plugins/tasklist/drivers/kolab/tasklist_kolab_driver.php
@@ -678,7 +678,7 @@ class tasklist_kolab_driver extends tasklist_driver
 
         // execute move command
         if ($task['_fromlist'] && ($fromfolder = $this->folders[$task['_fromlist']])) {
-            return $fromfolder->move($task['uid'], $folder->name);
+            return $fromfolder->move($task['id'], $folder->name);
         }
 
         return false;