diff --git a/source/table_editor.pas b/source/table_editor.pas
index 48c51641..01b9ad94 100644
--- a/source/table_editor.pas
+++ b/source/table_editor.pas
@@ -1477,6 +1477,7 @@ procedure TfrmTableEditor.treeIndexesInitChildren(Sender: TBaseVirtualTree;
 begin
   // Tell number of columns contained in index
   ChildCount := FKeys[Node.Index].Columns.Count;
+  ListColumns.Invalidate;
 end;