diff --git a/phpBB/phpbb/db/migration/data/v32x/fix_user_styles.php b/phpBB/phpbb/db/migration/data/v32x/fix_user_styles.php
new file mode 100644
index 0000000000..e0caae812a
--- /dev/null
+++ b/phpBB/phpbb/db/migration/data/v32x/fix_user_styles.php
@@ -0,0 +1,50 @@
+<?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 fix_user_styles extends \phpbb\db\migration\migration
+{
+
+	static public function depends_on()
+	{
+		return array(
+			'\phpbb\db\migration\data\v320\v320',
+		);
+	}
+
+	public function update_data()
+	{
+		return array(
+			array('custom', array(array($this, 'styles_fix'))),
+		);
+	}
+
+	public function styles_fix()
+	{
+		$default_style = (int) $this->config['default_style'];
+
+		// Get enabled styles
+		$sql = 'SELECT style_id
+			FROM ' . STYLES_TABLE . '
+			WHERE style_active = 1';
+		$result = $this->db->sql_query($sql);
+		$enabled_styles = $result->fetch_array();
+		$this->db->sql_freeresult($result);
+
+		// Set the default style to users who have an invalid style
+		$this->sql_query('UPDATE ' . USERS_TABLE . "
+			SET user_style = $default_style
+			WHERE " . $this->db->sql_in_set('user_style', $enabled_styles, true));
+	}
+}