How to stop warlock pet chatter?

I've put a warlock on my team for the first time. When I added /petattack to my dps macro, I noticed the imp likes to make a speech bubble. I'm spamming the dps button several times a second, so the imp is constantly chattering.

Is there any way to disable the pet speech bubbles? I found an option in the interface settings to ignore party chat bubbles, but apparently the pet doesn't count as a party member. I can turn off speech bubbles entirely, but I'd still like to see other player's and npc's bubbles.

Is there an addon or a macro setting that can help?