Remove selected item from listbox

Sorry, should be a simple one...

I can add an item from one list box to another using the following...

Private Sub ListBox1_Click()
    ListBox2.AddItem ListBox1.Value
End Sub

But I want to be able to remove the item from the listbox by clicking it. Tried this but doesn't work!

Private Sub ListBox2_Click()
     ListBox2.RemoveItem ListBox2.ListIndex
End Sub