diff --git a/doc/Jamfile.v2 b/doc/Jamfile.v2
index 6b938b8a5..ea2b2b2b7 100644
--- a/doc/Jamfile.v2
+++ b/doc/Jamfile.v2
@@ -42,4 +42,4 @@ boostbook geometry
 ;
 
 install pdf-install : geometry : <location>. <name>geometry.pdf <install-type>PDF ;
-
+explicit pdf-install ;