diff --git a/src/sampleplugins/samplefilterdyn/samplefilterdyn.h b/src/sampleplugins/samplefilterdyn/samplefilterdyn.h
index c0caafb3b..15353d9fd 100644
--- a/src/sampleplugins/samplefilterdyn/samplefilterdyn.h
+++ b/src/sampleplugins/samplefilterdyn/samplefilterdyn.h
@@ -43,6 +43,7 @@ public:
 	virtual const QString filterInfo(FilterIDType filter) const;
 	virtual bool autoDialog(QAction *) {return true;}
 	virtual void initParameterSet(QAction *,MeshModel &/*m*/, FilterParameterSet & /*parent*/);
+	virtual int postCondition( QAction* ) const {return MeshModel::MM_VERTCOLOR;};
 	virtual bool applyFilter(QAction *filter, MeshModel &m, FilterParameterSet & /*parent*/, vcg::CallBackPos * cb) ;
 	virtual const FilterClass getClass(QAction *);	
 };