diff --git a/src/meshlabplugins/filter_clean/cleanfilter.cpp b/src/meshlabplugins/filter_clean/cleanfilter.cpp
index 6e0c7bee9..fa73e666d 100644
--- a/src/meshlabplugins/filter_clean/cleanfilter.cpp
+++ b/src/meshlabplugins/filter_clean/cleanfilter.cpp
@@ -183,6 +183,10 @@ QString CleanFilter::filterName(FilterIDType filter) const
     }
   return 0;
 }
+ int CleanFilter::postCondition( QAction* /*filter*/ ) const
+ {
+     return MeshModel::MM_ALL;
+ }
 
 void CleanFilter::initParameterSet(QAction *action,MeshDocument &md, RichParameterSet & parlst)
 {
diff --git a/src/meshlabplugins/filter_clean/cleanfilter.h b/src/meshlabplugins/filter_clean/cleanfilter.h
index de4f0c956..c3c594d7e 100644
--- a/src/meshlabplugins/filter_clean/cleanfilter.h
+++ b/src/meshlabplugins/filter_clean/cleanfilter.h
@@ -71,11 +71,11 @@ public:
 
     virtual FilterClass getClass(QAction *);
     virtual int getRequirements(QAction *);
-
+    int postCondition(QAction* ) const;
+    int getPreConditions(QAction *) const {    return MeshModel::MM_NONE; } 
     virtual void initParameterSet(QAction *,MeshDocument &/*m*/, RichParameterSet & /*parent*/);
     virtual bool applyFilter(QAction *filter, MeshDocument &md, RichParameterSet & /*parent*/, vcg::CallBackPos * cb) ;
     FILTER_ARITY filterArity(QAction *) const {return SINGLE_MESH;}
-
 };