diff --git a/src/3rdParty/salomesmesh/inc/SMDS_Downward.hxx b/src/3rdParty/salomesmesh/inc/SMDS_Downward.hxx
index 34cded571..1725955df 100644
--- a/src/3rdParty/salomesmesh/inc/SMDS_Downward.hxx
+++ b/src/3rdParty/salomesmesh/inc/SMDS_Downward.hxx
@@ -90,7 +90,7 @@ public:
   static int getCellDimension(unsigned char cellType);
 protected:
   SMDS_Downward(SMDS_UnstructuredGrid *grid, int nbDownCells);
-  ~SMDS_Downward();
+  virtual ~SMDS_Downward();
   int addCell(int vtkId = -1);
   virtual void initCell(int cellId);
   virtual void allocate(int nbElems) = 0;
diff --git a/src/3rdParty/salomesmesh/inc/SMESH_MeshAlgos.hxx b/src/3rdParty/salomesmesh/inc/SMESH_MeshAlgos.hxx
index 9b860a6ab..ef616b9a4 100644
--- a/src/3rdParty/salomesmesh/inc/SMESH_MeshAlgos.hxx
+++ b/src/3rdParty/salomesmesh/inc/SMESH_MeshAlgos.hxx
@@ -53,6 +53,7 @@ class SMDS_Mesh;
 
 struct SMESHUtils_EXPORT SMESH_NodeSearcher
 {
+  virtual ~SMESH_NodeSearcher() {}
   virtual const SMDS_MeshNode* FindClosestTo( const gp_Pnt& pnt ) = 0;
   virtual void MoveNode( const SMDS_MeshNode* node, const gp_Pnt& toPnt ) = 0;
   virtual int  FindNearPoint(const gp_Pnt&                        point,