diff --git a/phpBB/includes/acp/acp_forums.php b/phpBB/includes/acp/acp_forums.php
index 6261f866bb..f2f1bd80e2 100644
--- a/phpBB/includes/acp/acp_forums.php
+++ b/phpBB/includes/acp/acp_forums.php
@@ -983,7 +983,7 @@ class acp_forums
 
 				if (!$row)
 				{
-					trigger_error($user->lang['PARENT_NOT_EXIST'] . adm_back_link($this->u_action . '&' . $this->parent_id), E_USER_WARNING);
+					trigger_error($user->lang['PARENT_NOT_EXIST'] . adm_back_link($this->u_action . '&parent_id=' . $this->parent_id), E_USER_WARNING);
 				}
 
 				if ($row['forum_type'] == FORUM_LINK)