diff --git a/FModel/MainWindow.cs b/FModel/MainWindow.cs
index 6ffa5f9e..72556829 100644
--- a/FModel/MainWindow.cs
+++ b/FModel/MainWindow.cs
@@ -992,6 +992,7 @@ namespace FModel
         private void AddAndSelectAllItems(string[] myItemsToAdd)
         {
             listBox1.BeginUpdate();
+            listBox1.Items.Clear();
             for (int i = 0; i < myItemsToAdd.Length; i++)
             {
                 listBox1.Items.Add(myItemsToAdd[i]);