How To Correct Recruiter?

I think my recruiter is under the impression that I am female but I am a cis (biological/assigned male at birth) male. I have a meeting with him in the next couple days, how should I correct him in a nice way? Should I send a quick text or tell him in person? I have a higher than normal voice and a few piercings so I get why he thought I was a female. I put M on the application thing. I dont want to be disqualified because they think Im transgender, I know that transgender people aren't allowed in the military at the moment