diff --git a/v2/tools/cw.jam b/v2/tools/cw.jam
index beb7737ea..3b0a4ba71 100644
--- a/v2/tools/cw.jam
+++ b/v2/tools/cw.jam
@@ -134,6 +134,9 @@ flags cw.compile CFLAGS <inlining>off : -inline off ;
 flags cw.compile CFLAGS <inlining>on : -inline on ;
 flags cw.compile CFLAGS <inlining>full : -inline all ;
 flags cw.compile CFLAGS <exception-handling>off : -Cpp_exceptions off ;
+
+
+flags cw.compile CFLAGS <rtti>on : -RTTI on ;
 flags cw.compile CFLAGS <rtti>off : -RTTI off ;
 
 flags cw.compile CFLAGS <warnings>on : -w on ;