diff --git a/historic/jam/doc/build.jam b/historic/jam/doc/build.jam
index 5f23814e2..5523007ae 100644
--- a/historic/jam/doc/build.jam
+++ b/historic/jam/doc/build.jam
@@ -30,6 +30,7 @@ boostbook standalone
         <dependency>html
         <dependency>html/images
         <xsl:param>boost.root=.
+        -<xsl:param>nav.layout=horizontal
         <xsl:param>nav.layout=none
         <format>html:<xsl:param>admon.graphics.path=images/
         <format>html:<xsl:param>navig.graphics.path=images/