diff --git a/doc/Jamfile.v2 b/doc/Jamfile.v2
index f59b823..978b370 100644
--- a/doc/Jamfile.v2
+++ b/doc/Jamfile.v2
@@ -9,5 +9,6 @@ import boostbook : boostbook ;
 boostbook ref-doc : ref.xml 
 	:
         <format>pdf:<xsl:param>boost.url.prefix=http://www.boost.org/doc/libs/release/doc/html
+        <xsl:param>boost.root=../../../..
 	;