diff --git a/doc/Jamfile.v2 b/doc/Jamfile.v2
index 57995eba..ceb7d91a 100644
--- a/doc/Jamfile.v2
+++ b/doc/Jamfile.v2
@@ -48,4 +48,6 @@ boostbook standalone : unordered :
     <format>pdf:<xsl:param>img.src.path=$(images_location)/
     #<format>pdf:<xsl:param>admon.graphics.path=$(admonishment_location)
     <format>pdf:<xsl:param>draft.mode="no"
+    <format>pdf:<xsl:param>boost.url.prefix=http://www.boost.org/doc/libs/release/libs/unordered/doc/html
     ;
+