diff --git a/phpBB/includes/ucp/ucp_register.php b/phpBB/includes/ucp/ucp_register.php
index 25dc2e4b97..9b28fa0cf6 100644
--- a/phpBB/includes/ucp/ucp_register.php
+++ b/phpBB/includes/ucp/ucp_register.php
@@ -509,7 +509,7 @@ class ucp_register
 
 			'L_CONFIRM_EXPLAIN'			=> sprintf($user->lang['CONFIRM_EXPLAIN'], '<a href="mailto:' . htmlspecialchars($config['board_contact']) . '">', '</a>'),
 			'L_REG_COND'				=> $l_reg_cond,
-			'L_USERNAME_EXPLAIN'		=> sprintf($user->lang[$user_char_ary[str_replace('\\\\', '\\', $config['allow_name_chars'])] . '_EXPLAIN'], $config['min_name_chars'], $config['max_name_chars']),
+			'L_USERNAME_EXPLAIN'		=> sprintf($user->lang[$config['allow_name_chars'] . '_EXPLAIN'], $config['min_name_chars'], $config['max_name_chars']),
 			'L_PASSWORD_EXPLAIN'		=> sprintf($user->lang[$config['pass_complex'] . '_EXPLAIN'], $config['min_pass_chars'], $config['max_pass_chars']),
 
 			'S_LANG_OPTIONS'	=> language_select($data['lang']),