<?xml version="1.0"?>
-<ruleset>
+<ruleset
+ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:noNamespaceSchemaLocation="https://raw.githubusercontent.com/squizlabs/PHP_CodeSniffer/master/phpcs.xsd"
+>
<file>wcfsetup/</file>
<exclude-pattern>lib/system/api/*</exclude-pattern>
<arg name="extensions" value="php" />