diff --git a/doc/Jamfile b/doc/Jamfile
index 56b825d..99f744a 100644
--- a/doc/Jamfile
+++ b/doc/Jamfile
@@ -2,7 +2,7 @@
 # Distributed under the Boost Software License, Version 1.0.
 # https://www.boost.org/LICENSE_1_0.txt
 
-using asciidoctor ;
+import asciidoctor ;
 
 html lambda2.html : lambda2.adoc ;