Newsflash: Can the appraiser change fees just before closing?

New construction and set to close in a week. Appraiser is changing his fee by <$100. It's not much, and I'll probably just pay it, but is this acceptable practice?

Read more at https://www.reddit.com/r/RealEstate/comments/6pjvz7/can_the_appraiser_change_fees_just_before_closing/?utm_source=ifttt