Finding out the gender

So this will be our 4th baby (5th pregnancy). Hubby has changed his mind about waiting till birth to find out if the baby is a boy or girl. When we originally started trying I voiced to him I wanted to wait because this is going to be our last. We waited to find out until birth with our 1st baby, found out with baby 2&3, lost 4th before we could find out, and now this current baby (our 20 week scan is in 1 1/2 weeks). He told me he would rather find out and he just won’t tell me but I really feel like he’s going to let it slip or he’ll tell someone. I am trying to validate his side as well but can’t seem to come up with a compromise we both agree with. I went along with finding out the last 2 so I just really don’t want to know this time. I had suggested we inform the ultrasound tech that he would like to know but I don’t and just have her show baby privates while I look away (but she doesn’t tell him what it is) he can see for himself which I think he’ll obviously be able to tell. Then he says nothing about it and it’s still somewhat of a surprise because he “could guess wrong”… we’ve never really have a disagreement on this before so I’m just curious if anyone else has experienced this and if so what did you don’t resolve it?