diff --git a/doc/reference/docbook.build b/doc/reference/docbook.build
index aa16d64e..b38f81be 100644
--- a/doc/reference/docbook.build
+++ b/doc/reference/docbook.build
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8" ?>
-<project name="DocBook" default="pdf" xmlns="http://nant.sf.net/release/0.85/nant.xsd">
+<project name="DocBook" default="all" xmlns="http://nant.sf.net/release/0.85/nant.xsd">
 
   <property name="project.basedir" value="${project::get-base-directory()}" />
   <property name="project.targetdir" value="${project.basedir}\target" />