Confusion in your CV?

Hello,

I've written an application and CV for a temporary position at a supermarket. I'd like to earn some money alongside my school life and gain some initial professional experience. Unfortunately, I made a mistake in my CV that I noticed too late. I listed Spanish as fluent and English as basic under language skills, even though it should have been the other way around. I have my interview in a few days and wanted to ask if this mistake is a big deal.

Thank you for your feedback