diff --git a/src/Editor/Undo/CClearSelectionCommand.h b/src/Editor/Undo/CClearSelectionCommand.h
index dca76200..28f307e2 100644
--- a/src/Editor/Undo/CClearSelectionCommand.h
+++ b/src/Editor/Undo/CClearSelectionCommand.h
@@ -18,7 +18,7 @@ public:
           mpSelection(pSelection)
     {
         for (CSelectionIterator It(pSelection); It; ++It)
-            mOldSelection << *It;
+            mOldSelection.push_back(*It);
     }
 
     void undo() override { mpSelection->SetSelectedNodes(mOldSelection.DereferenceList()); }