diff --git a/src/SMESH/SMESH_MeshEditor.cxx b/src/SMESH/SMESH_MeshEditor.cxx
index 7691b580d..6088625bd 100644
--- a/src/SMESH/SMESH_MeshEditor.cxx
+++ b/src/SMESH/SMESH_MeshEditor.cxx
@@ -3115,7 +3115,7 @@ void SMESH_MeshEditor::Smooth (TIDSortedElemSet &          theElems,
     SMDS_FaceIteratorPtr fIt = aMesh->facesIterator();
     while ( fIt->more() ) {
       const SMDS_MeshElement* face = fIt->next();
-      theElems.insert( face );
+      theElems.insert( theElems.end(), face );
     }
   }
   // get all face ids theElems are on