#VALUE from VBA function

I've written a function that works similiarly to the Excel FIND function. Now, if FIND cannot find the first string inside the second it returns a #VALUE error. How can I make my function do the same?

I am aware of the xlErrValue constant, which returns the error number corresponding to #VALUE (which is 2015) but when I use my function in a cell and it returns this value I literally get 2015 displaying in the cell and not #VALUE as I want.

What extra trick is required to make Excel realise that a function is returning an error value, not a numeric value?

That'll do it. Thanks mate!