diff --git a/reference/intl/constants.xml b/reference/intl/constants.xml
index 28459bdc0c..2631d28b04 100644
--- a/reference/intl/constants.xml
+++ b/reference/intl/constants.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
 <appendix xml:id="intl.constants" xmlns="http://docbook.org/ns/docbook"
  xmlns:xlink="http://www.w3.org/1999/xlink">
diff --git a/reference/intl/idn/idn-to-utf8.xml b/reference/intl/idn/idn-to-utf8.xml
index e953649987..6458ad4726 100644
--- a/reference/intl/idn/idn-to-utf8.xml
+++ b/reference/intl/idn/idn-to-utf8.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision: 283819 $ -->
 <refentry xml:id="function.idn-to-utf8" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
  <refnamediv>