How to disable "unsafe volume" warning?

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http://forums.androidcentral.com – There's a thread about this in the N4 section, but I didn't see any answers there, so I figured I'd post here. Lately when I try to turn the volume up with the side rocker, I often get a popup message "Raise volume above safe level? Listening at high volume for long periods may damage your hearing." It's very annoying, and I'd like to disable it. (HowTos)