diff --git a/phpBB/phpbb/db/migration/data/v32x/user_notifications_table_unique_index.php b/phpBB/phpbb/db/migration/data/v32x/user_notifications_table_unique_index.php
index 3145b634c8..157a12472b 100644
--- a/phpBB/phpbb/db/migration/data/v32x/user_notifications_table_unique_index.php
+++ b/phpBB/phpbb/db/migration/data/v32x/user_notifications_table_unique_index.php
@@ -27,7 +27,7 @@ class user_notifications_table_unique_index extends \phpbb\db\migration\migratio
 		return array(
 			'add_unique_index'  => array(
 				$this->table_prefix . 'user_notifications' => array(
-					'itm_usr_mthd'	=> array('item_type', 'item_id', 'user_id'),
+					'itm_usr_mthd'	=> array('item_type', 'item_id', 'user_id', 'method'),
 				),
 			),
 		);