diff --git a/doc/Jamfile.v2 b/doc/Jamfile.v2
index d6a7076..eeb464c 100644
--- a/doc/Jamfile.v2
+++ b/doc/Jamfile.v2
@@ -29,6 +29,7 @@ boostbook standalone
         <xsl:param>toc.section.depth=2
         <xsl:param>chunk.section.depth=1
         <format>pdf:<xsl:param>img.src.path=$(images)/
+        <format>pdf:<xsl:param>boost.url.prefix=http://www.boost.org/doc/libs/release/libs/optional/doc/html
     ;