Ah, okay, it does not apply for EU nations (like Croatia) and Switzerland, so it's not a worry for the OP and would matter only if other countries would be involved.
Croatia will be joining the EU in 2023 afaik.
edit: seeing multiple other comments here that is already a member so I guess I am mistaken
It will join the Schengen area next. Also it plans to adopt the euro in 2023.