diff --git a/phpBB/includes/functions_user.php b/phpBB/includes/functions_user.php
index 1939d0ff78..340f03c0c0 100644
--- a/phpBB/includes/functions_user.php
+++ b/phpBB/includes/functions_user.php
@@ -749,8 +749,9 @@ function user_delete($mode, $user_ids, $retain_username = true)
 	$db->sql_query($sql);
 
 	// Delete the user_id from the banlist
-	$sql = 'DELETE FROM ' . BANS_TABLE . '
-		WHERE ban_mode = \'user\' AND ' . $db->sql_in_set('ban_userid', $user_ids);
+	$sql = 'DELETE FROM ' . BANS_TABLE . "
+		WHERE ban_mode = 'user'
+			AND " . $db->sql_in_set('ban_userid', $user_ids);
 	$db->sql_query($sql);
 
 	// Delete the user_id from the session table