Thanks for your suggestion. This clearly works, but it's the kind of thing I was hoping to avoid as I already have several subs that modify the number of elements in the listbox, and I was hoping to avoid having to chase down every place that happened. I should have made this more clear in the question. This does suggest a solution where any any subroutine that modifies the size of the listbox is required to use something like your add or delete to do so - but that would have required some forethought ;)