diff --git a/idlc/inc/idlc/asttype.hxx b/idlc/inc/idlc/asttype.hxx
index bd25f8737ff9..1220ad025500 100644
--- a/idlc/inc/idlc/asttype.hxx
+++ b/idlc/inc/idlc/asttype.hxx
@@ -4,9 +4,9 @@
  *
  *  $RCSfile: asttype.hxx,v $
  *
- *  $Revision: 1.2 $
+ *  $Revision: 1.3 $
  *
- *  last change: $Author: rt $ $Date: 2005-09-07 18:02:20 $
+ *  last change: $Author: rt $ $Date: 2006-03-09 10:48:20 $
  *
  *  The Contents of this file are made available subject to
  *  the terms of GNU Lesser General Public License Version 2.1.
@@ -47,6 +47,8 @@ public:
         {}
 
     virtual ~AstType() {}
+
+    virtual bool isUnsigned() const { return false; }
 };
 
 #endif // _IDLC_ASTTYPE_HXX_