Dear users,
I apologise in advance for not using IPA symbols here, as I do not know how.
Today I ran across a slight problem:

I am aware that possessive form of words ending with "s" is made by putting the apostrophe after the "s". I also know how to deal with pronunciation when this is the case.
But I am not really sure with the word "bosses" pronounced 'bosiz. I would put the possessive apostrophe on the very end like this: "bosses' ". But how is that pronounced? I cannot really say 'bosisiz, can I?
Thank you for the help.