diff --git a/src/OBJECT/SMESH_Actor.cxx b/src/OBJECT/SMESH_Actor.cxx
index 23b3cb597..48b0c7d0f 100644
--- a/src/OBJECT/SMESH_Actor.cxx
+++ b/src/OBJECT/SMESH_Actor.cxx
@@ -1453,27 +1453,27 @@ void SMESH_ActorDef::UnShrink()
 }
 
 
-int SMESH_ActorDef::GetNodeObjId(int theVtkID)
+vtkIdType SMESH_ActorDef::GetNodeObjId(vtkIdType theVtkID)
 {
   return myPickableActor->GetNodeObjId(theVtkID);
 }
 
-double* SMESH_ActorDef::GetNodeCoord(int theObjID)
+double* SMESH_ActorDef::GetNodeCoord(vtkIdType theObjID)
 {
   return myPickableActor->GetNodeCoord(theObjID);
 }
 
-int SMESH_ActorDef::GetNodeVtkId(int theObjID)
+vtkIdType SMESH_ActorDef::GetNodeVtkId(vtkIdType theObjID)
 {
   return myPickableActor->GetNodeVtkId(theObjID);
 }
 
-int SMESH_ActorDef::GetElemObjId(int theVtkID)
+vtkIdType SMESH_ActorDef::GetElemObjId(vtkIdType theVtkID)
 {
   return myPickableActor->GetElemObjId(theVtkID);
 }
 
-vtkCell* SMESH_ActorDef::GetElemCell(int theObjID)
+vtkCell* SMESH_ActorDef::GetElemCell(vtkIdType theObjID)
 {
   return myPickableActor->GetElemCell(theObjID);
 }
diff --git a/src/OBJECT/SMESH_ActorDef.h b/src/OBJECT/SMESH_ActorDef.h
index 36ef136fa..de1e91a63 100644
--- a/src/OBJECT/SMESH_ActorDef.h
+++ b/src/OBJECT/SMESH_ActorDef.h
@@ -144,12 +144,12 @@ class SMESH_ActorDef : public SMESH_Actor
   virtual void SetBallScale(double size);
   virtual double GetBallScale();
 
-  virtual int GetNodeObjId(int theVtkID);
-  virtual double* GetNodeCoord(int theObjID);
-  virtual int GetNodeVtkId(int theObjID);
+  virtual vtkIdType GetNodeObjId(vtkIdType theVtkID);
+  virtual double* GetNodeCoord(vtkIdType theObjID);
+  virtual vtkIdType GetNodeVtkId(vtkIdType theObjID);
 
-  virtual int GetElemObjId(int theVtkID);
-  virtual vtkCell* GetElemCell(int theObjID);
+  virtual vtkIdType GetElemObjId(vtkIdType theVtkID);
+  virtual vtkCell* GetElemCell(vtkIdType theObjID);
 
   virtual int GetObjDimension( const int theObjId );
 
diff --git a/src/OBJECT/SMESH_DeviceActor.cxx b/src/OBJECT/SMESH_DeviceActor.cxx
index 11eea4384..6fc318d08 100644
--- a/src/OBJECT/SMESH_DeviceActor.cxx
+++ b/src/OBJECT/SMESH_DeviceActor.cxx
@@ -839,9 +839,9 @@ SMESH_DeviceActor
 }
 
 
-int
+vtkIdType
 SMESH_DeviceActor
-::GetNodeObjId(int theVtkID)
+::GetNodeObjId(vtkIdType theVtkID)
 {
   vtkIdType anID = theVtkID;
 
@@ -855,7 +855,7 @@ SMESH_DeviceActor
 
 double* 
 SMESH_DeviceActor
-::GetNodeCoord(int theObjID)
+::GetNodeCoord(vtkIdType theObjID)
 {
   vtkDataSet* aDataSet = myMergeFilter->GetOutput();
   vtkIdType anID = myVisualObj->GetNodeVTKId(theObjID);
@@ -864,16 +864,16 @@ SMESH_DeviceActor
   return aCoord;
 }
 
-int
+vtkIdType
 SMESH_DeviceActor
-::GetNodeVtkId(int theObjID) 
+::GetNodeVtkId(vtkIdType theObjID) 
 {
   return myVisualObj->GetNodeVTKId(theObjID);
 }
 
-int
+vtkIdType
 SMESH_DeviceActor
-::GetElemObjId(int theVtkID)
+::GetElemObjId(vtkIdType theVtkID)
 {
   vtkIdType anId = myGeomFilter->GetElemObjId(theVtkID);
   if(anId < 0) 
@@ -897,7 +897,7 @@ SMESH_DeviceActor
 
 vtkCell* 
 SMESH_DeviceActor
-::GetElemCell(int theObjID)
+::GetElemCell(vtkIdType theObjID)
 {
   vtkDataSet* aDataSet = myVisualObj->GetUnstructuredGrid();
   vtkIdType aGridID = myVisualObj->GetElemVTKId(theObjID);
diff --git a/src/OBJECT/SMESH_DeviceActor.h b/src/OBJECT/SMESH_DeviceActor.h
index 70c39ba71..68b1d2b6b 100644
--- a/src/OBJECT/SMESH_DeviceActor.h
+++ b/src/OBJECT/SMESH_DeviceActor.h
@@ -68,12 +68,12 @@ class SMESHOBJECT_EXPORT SMESH_DeviceActor: public vtkLODActor{
   void SetStoreGemetryMapping(bool theStoreMapping);
   void SetStoreIDMapping(bool theStoreMapping);
 
-  virtual int GetNodeObjId(int theVtkID);
-  virtual double* GetNodeCoord(int theObjID);
-  virtual int GetNodeVtkId(int theObjID);
+  virtual vtkIdType GetNodeObjId(vtkIdType theVtkID);
+  virtual double* GetNodeCoord(vtkIdType theObjID);
+  virtual vtkIdType GetNodeVtkId(vtkIdType theObjID);
 
-  virtual int GetElemObjId(int theVtkID);
-  virtual vtkCell* GetElemCell(int theObjID);
+  virtual vtkIdType GetElemObjId(vtkIdType theVtkID);
+  virtual vtkCell* GetElemCell(vtkIdType theObjID);
 
   virtual void SetTransform(VTKViewer_Transform* theTransform); 
   virtual vtkMTimeType GetMTime();
diff --git a/src/SMESH_I/SMESH_PythonDump.cxx b/src/SMESH_I/SMESH_PythonDump.cxx
index 21759ac60..1aea50e31 100644
--- a/src/SMESH_I/SMESH_PythonDump.cxx
+++ b/src/SMESH_I/SMESH_PythonDump.cxx
@@ -141,7 +141,7 @@ namespace SMESH
 
   TPythonDump&
   TPythonDump::
-  operator<<(SMESH::smIdType theArg){
+  operator<<(long long theArg){
     myStream<<theArg;
     return *this;
   }
diff --git a/src/SMESH_I/SMESH_PythonDump.hxx b/src/SMESH_I/SMESH_PythonDump.hxx
index 5ce60488c..ab27d956f 100644
--- a/src/SMESH_I/SMESH_PythonDump.hxx
+++ b/src/SMESH_I/SMESH_PythonDump.hxx
@@ -135,7 +135,7 @@ namespace SMESH
     operator<<(int theArg);
 
     TPythonDump&
-    operator<<(SMESH::smIdType theArg);
+    operator<<(long long theArg);
 
     TPythonDump&
     operator<<(double theArg);