diff --git a/build/build.xml b/build/build.xml
index ae8f197..afad24b 100644
--- a/build/build.xml
+++ b/build/build.xml
@@ -199,6 +199,9 @@
     <replaceregexp match="Turtle" replace="Boost.Mock" flags="g">
       <fileset dir="${boost.dir}/libs/mock" includes="**/*.qbk"/>
     </replaceregexp>
+    <copy todir="${boost.dir}/libs/mock/doc" overwrite="true">
+      <fileset dir="${env.BOOST_ROOT}/tools/boostbook" includes="xsl/navbar.xsl"/>
+    </copy>
   </target>
 
   <target name="boost.test" description="run boost.mock tests in ${boost.dir}">