Apple is expected to ship the iPhone 7 without a headphone jack, and the company’s already facing some tough pushback for the rumored change. Now even departed company co-founder Steve Wozniak is chiming in with a word of warning for the Cupertino company he helped launch.

“If it’s missing the 3.5mm earphone jack, that’s going to tick off a lot of people,” Wozniak told The Australian Financial Review. “I would not use Bluetooth… I don’t like wireless. I have cars where you can plug in the music or go through Bluetooth, and the Bluetooth just sounds so flat for the same music.”

Wozniak added that he would consider trying Bluetooth if Apple could offer some new version of the wireless technology with “higher bandwidth and better quality that sounds like real music.” He noted that the company has a history of pushing forward with new technology, so it’s possible Cupertino could do the same thing with Bluetooth for the iPhone 7.

Apple’s co-founder also admitted he has a personal reason for keeping his current headphones. Wozniak owns a pair of earbuds with custom-designed implants that are comfortable enough to sleep in. If the iPhone 7 does ship without a headphone jack, he’ll have to use some kind of adapter

We’ve already seen Apple’s rumored adapter leak out. The accessory would make it possible for users to plug their old headphones into the iPhone’s Lightning port. The company’s also allegedly working on a pair of Bluetooth EarPods, though they may not be ready to launch with the iPhone 7.