diff --git a/phpBB/phpbb/db/migration/data/v32x/user_notifications_table_remove_duplicates.php b/phpBB/phpbb/db/migration/data/v32x/user_notifications_table_remove_duplicates.php
index 50d0642056..371cdf9b3a 100644
--- a/phpBB/phpbb/db/migration/data/v32x/user_notifications_table_remove_duplicates.php
+++ b/phpBB/phpbb/db/migration/data/v32x/user_notifications_table_remove_duplicates.php
@@ -18,7 +18,7 @@ class user_notifications_table_remove_duplicates extends \phpbb\db\migration\mig
 	static public function depends_on()
 	{
 		return array(
-			'\phpbb\db\migration\data\v32x\user_notifications_table_temp_index',
+			'\phpbb\db\migration\data\v32x\user_notifications_table_index_p3',
 		);
 	}
 
diff --git a/phpBB/phpbb/db/migration/data/v32x/user_notifications_table_temp_index.php b/phpBB/phpbb/db/migration/data/v32x/user_notifications_table_temp_index.php
deleted file mode 100644
index a6a321dbde..0000000000
--- a/phpBB/phpbb/db/migration/data/v32x/user_notifications_table_temp_index.php
+++ /dev/null
@@ -1,46 +0,0 @@
-<?php
-/**
- *
- * This file is part of the phpBB Forum Software package.
- *
- * @copyright (c) phpBB Limited <https://www.phpbb.com>
- * @license GNU General Public License, version 2 (GPL-2.0)
- *
- * For full copyright and license information, please see
- * the docs/CREDITS.txt file.
- *
- */
-
-namespace phpbb\db\migration\data\v32x;
-
-class user_notifications_table_temp_index extends \phpbb\db\migration\migration
-{
-	static public function depends_on()
-	{
-		return array(
-			'\phpbb\db\migration\data\v32x\user_notifications_table_index_p3',
-		);
-	}
-
-	public function update_schema()
-	{
-		return array(
-			'add_index' => array(
-				$this->table_prefix . 'user_notifications' => array(
-					'itm_usr_mthd'	=> array('item_type', 'item_id', 'user_id'),
-				),
-			),
-		);
-	}
-
-	public function revert_schema()
-	{
-		return array(
-			'drop_keys' => array(
-				$this->table_prefix . 'user_notifications' => array(
-					'itm_usr_mthd',
-				),
-			),
-		);
-	}
-}
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 d279af7fec..3145b634c8 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
@@ -25,11 +25,6 @@ class user_notifications_table_unique_index extends \phpbb\db\migration\migratio
 	public function update_schema()
 	{
 		return array(
-			'drop_keys'			=> array(
-				$this->table_prefix . 'user_notifications' => array(
-					'itm_usr_mthd',
-				),
-			),
 			'add_unique_index'  => array(
 				$this->table_prefix . 'user_notifications' => array(
 					'itm_usr_mthd'	=> array('item_type', 'item_id', 'user_id'),