Harmony issues...AppleTV and MBP in same room

I have my Harmony set up to control the AppleTV just fine, but since my MBP is in the same room, it ends up controlling both at the same time.

Can I turn off the IR port on my MBP, or is there a more elegant way than a piece of duct tape to keep my Mac from responding to commands meant for the AppleTV?

So simple. I didn't even think to look in Sys Prefs.

THANKS!