diff --git a/dev/codesniffer/ruleset.xml b/dev/codesniffer/ruleset.xml
index 24cc4b46e7b..f507d5c2a16 100755
--- a/dev/codesniffer/ruleset.xml
+++ b/dev/codesniffer/ruleset.xml
@@ -46,6 +46,9 @@
 		</rule>
 	-->
 
+    <!-- PHP code MUST use only UTF-8 without BOM. -->
+    <rule ref="Generic.Files.ByteOrderMark"/>
+
 	<!-- Lines can be 85 chars long, but never show errors -->
 	<rule ref="Generic.Files.LineLength">
 		<properties>