diff --git a/default.docbook5 b/default.docbook5
index b3a0b6def..415ccf9c3 100644
--- a/default.docbook5
+++ b/default.docbook5
@@ -1,10 +1,11 @@
 <?xml version="1.0" encoding="utf-8" ?>
 <!DOCTYPE article>
+<article
+  xmlns="http://docbook.org/ns/docbook" version="5.0"
 $if(mathml)$
-<article xmlns="http://docbook.org/ns/docbook" version="5.0">
-$else$
-<article xmlns="http://docbook.org/ns/docbook" version="5.0">
+  xmlns:mml="http://www.w3.org/1998/Math/MathML"
 $endif$
+  xmlns:xlink="http://www.w3.org/1999/xlink" >
   <info>
     <title>$title$</title>
 $if(author)$