diff --git a/plugins/tasklist/tasklist.js b/plugins/tasklist/tasklist.js
index 7ef9463e..b2829ffb 100644
--- a/plugins/tasklist/tasklist.js
+++ b/plugins/tasklist/tasklist.js
@@ -1540,6 +1540,7 @@ function rcube_tasklist_ui(settings)
         }
 
         li.remove();
+        delete listdata[id];
     }
 
     /**
diff --git a/plugins/tasklist/tasklist.php b/plugins/tasklist/tasklist.php
index d7448d09..325c5bd4 100644
--- a/plugins/tasklist/tasklist.php
+++ b/plugins/tasklist/tasklist.php
@@ -245,6 +245,10 @@ class tasklist extends rcube_plugin
                         $this->driver->edit_task($child);
                     }
                 }
+                // update parent task to adjust list of children
+                if (!empty($oldrec['parent_id'])) {
+                    $refresh[] = $this->driver->get_task(array('id' => $oldrec['parent_id'], 'list' => $rec['list']));
+                }
             }
 
             if (!$success)