diff --git a/helper/ccnb-parser/visitors/ccnb-parser-void-visitor.h b/helper/ccnb-parser/visitors/ccnb-parser-void-visitor.h
index 9b45836..4fd228d 100644
--- a/helper/ccnb-parser/visitors/ccnb-parser-void-visitor.h
+++ b/helper/ccnb-parser/visitors/ccnb-parser-void-visitor.h
@@ -44,6 +44,8 @@
   virtual void visit (Dtag&,  boost::any)=0; ///< \brief Method accepting DTAG block  
   virtual void visit (Dattr&, boost::any)=0; ///< \brief Method accepting DATTR block 
   virtual void visit (Ext&,   boost::any)=0; ///< \brief Method accepting EXT block
+
+  virtual ~VoidVisitor () { }
 };
 
 }