diff --git a/doc/src/sgml/stylesheet-hh.xsl b/doc/src/sgml/stylesheet-hh.xsl
index 1b1ab4bbe9..6f4b706dac 100644
--- a/doc/src/sgml/stylesheet-hh.xsl
+++ b/doc/src/sgml/stylesheet-hh.xsl
@@ -1,8 +1,6 @@
 <?xml version='1.0'?>
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
-                version='1.0'
-                xmlns="http://www.w3.org/TR/xhtml1/transitional"
-                exclude-result-prefixes="#default">
+                version='1.0'>
 
 <xsl:import href="http://docbook.sourceforge.net/release/xsl/current/htmlhelp/htmlhelp.xsl"/>
 <xsl:include href="stylesheet-common.xsl" />
diff --git a/doc/src/sgml/stylesheet-html-common.xsl b/doc/src/sgml/stylesheet-html-common.xsl
index d9961089c6..96dd2cc038 100644
--- a/doc/src/sgml/stylesheet-html-common.xsl
+++ b/doc/src/sgml/stylesheet-html-common.xsl
@@ -4,7 +4,8 @@
 %common.entities;
 ]>
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
-                version="1.0">
+                version="1.0"
+                xmlns="http://www.w3.org/1999/xhtml">
 
 <!--
   This file contains XSLT stylesheet customizations that are common to
diff --git a/doc/src/sgml/stylesheet-html-nochunk.xsl b/doc/src/sgml/stylesheet-html-nochunk.xsl
index 78add26a9f..8167127b93 100644
--- a/doc/src/sgml/stylesheet-html-nochunk.xsl
+++ b/doc/src/sgml/stylesheet-html-nochunk.xsl
@@ -1,8 +1,6 @@
 <?xml version='1.0'?>
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
-                version='1.0'
-                xmlns="http://www.w3.org/TR/xhtml1/transitional"
-                exclude-result-prefixes="#default">
+                version='1.0'>
 
 <xsl:import href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"/>
 <xsl:include href="stylesheet-common.xsl" />
diff --git a/doc/src/sgml/stylesheet-text.xsl b/doc/src/sgml/stylesheet-text.xsl
index 476b871870..529cc9ec38 100644
--- a/doc/src/sgml/stylesheet-text.xsl
+++ b/doc/src/sgml/stylesheet-text.xsl
@@ -1,8 +1,7 @@
 <?xml version='1.0'?>
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                 version='1.0'
-                xmlns="http://www.w3.org/TR/xhtml1/transitional"
-                exclude-result-prefixes="#default">
+                xmlns="http://www.w3.org/1999/xhtml">
 
 <xsl:import href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"/>
 <xsl:import href="stylesheet-common.xsl" />
diff --git a/doc/src/sgml/stylesheet.xsl b/doc/src/sgml/stylesheet.xsl
index 0eac594f0c..b6141303ab 100644
--- a/doc/src/sgml/stylesheet.xsl
+++ b/doc/src/sgml/stylesheet.xsl
@@ -1,8 +1,7 @@
 <?xml version='1.0'?>
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                 version='1.0'
-                xmlns="http://www.w3.org/TR/xhtml1/transitional"
-                exclude-result-prefixes="#default">
+                xmlns="http://www.w3.org/1999/xhtml">
 
 <xsl:import href="http://docbook.sourceforge.net/release/xsl/current/xhtml/chunk.xsl"/>
 <xsl:include href="stylesheet-common.xsl" />