diff --git a/dev/phpcheckstyle/phpstandard.cfg.xml b/dev/phpcheckstyle/phpstandard.cfg.xml
index 15967aafcb2..3dd3b314660 100644
--- a/dev/phpcheckstyle/phpstandard.cfg.xml
+++ b/dev/phpcheckstyle/phpstandard.cfg.xml
@@ -1,3 +1,5 @@
+<?xml version="1.0"?>
+<!DOCTYPE phpstandard SYSTEM "phpstandard.dtd">
 <!-- somewhat inspired by java checkstyle -->
 <phpcheckstyle-configuration>