diff --git a/test/codesniffer/ruleset.xml b/test/codesniffer/ruleset.xml
index 445aa112bfe..70920a5e9e4 100755
--- a/test/codesniffer/ruleset.xml
+++ b/test/codesniffer/ruleset.xml
@@ -1,4 +1,5 @@
 <?xml version="1.0"?>
+<!DOCTYPE ruleset SYSTEM "ruleset.dtd">
 <ruleset name="Dolibarr">
 	<description>Dolibarr coding standard.</description>