diff --git a/src/SMESH_I/SMESH_Pattern_i.cxx b/src/SMESH_I/SMESH_Pattern_i.cxx
index 3d725b8fb..2a799a5b6 100644
--- a/src/SMESH_I/SMESH_Pattern_i.cxx
+++ b/src/SMESH_I/SMESH_Pattern_i.cxx
@@ -387,7 +387,14 @@ CORBA::Boolean SMESH_Pattern_i::MakeMesh (SMESH::SMESH_Mesh_ptr theMesh,
                 << CreatePolygons << ", " << CreatePolyedrs << " )";
   addErrorCode( "MakeMesh" );
 
-  return myPattern.MakeMesh( aMesh, CreatePolygons, CreatePolyedrs );
+  int nb = aMesh->NbNodes() + aMesh->NbEdges() + aMesh->NbFaces() + aMesh->NbVolumes();
+
+  bool res = myPattern.MakeMesh( aMesh, CreatePolygons, CreatePolyedrs );
+
+  if ( nb > 0 && nb != aMesh->NbNodes() + aMesh->NbEdges() + aMesh->NbFaces() + aMesh->NbVolumes())
+    aMesh->SetIsModified(true);
+
+  return res;
 }
 
 //=======================================================================