diff --git a/src/tools/boostbook.jam b/src/tools/boostbook.jam
index 14114d9d0..a779ea129 100644
--- a/src/tools/boostbook.jam
+++ b/src/tools/boostbook.jam
@@ -7,6 +7,7 @@
 #  This module defines rules to handle generation of documentation
 #  from BoostBook sources.
 
+import "class" : new ;
 import common ;
 import errors ;
 import targets ;