diff --git a/src/tools/boostbook.jam b/src/tools/boostbook.jam
index 8c7ae3741..1006f496e 100644
--- a/src/tools/boostbook.jam
+++ b/src/tools/boostbook.jam
@@ -203,7 +203,7 @@ class xml-catalog-action : action
 
     rule __init__ ( target : property-set ? )
     {
-        action.__init__ $(target) : : generate-xml-catalog : $(property-set) ;
+        action.__init__ $(target) : generate-xml-catalog : $(property-set) ;
     }
     
   rule actualize ( )