Thursday night, Eminem surprised fans with a 13-track project titled Kamikaze. It includes features from a number of big artists, including Bon Iver’s Justin Vernon on the track “Fall.” Vernon tweeted that he’s not happy with the song because of Eminem’s use of a homophobic slur, and asked for it to be changed.

“Not a fan of the message, it’s tired,” he wrote. “Asked them to change the track, wouldn’t do it.”

In “Fall,” Eminem uses a slur to take shots at Tyler, the Creator in one of his many disses on the project.

Tyler create nothing, I see why you called yourself a faggot bitch

It's not just 'cause you lack attention

It’s because you worship D12's balls, you’re sacrilegious

If you're gonna critique me, you better at least be as good or better

Get Earl the Hooded Sweater, whatever his name is to help you put together

Some words, more than just two letters 

Vernon says he was not in the studio during the time of the recording. He also praised Eminem as a legend, but encouraged him not to diss younger artists or use problematic language. “This is not the time to criticize Youth, it's the time to listen,” he wrote.

It's not clear what his plan is, but Vernon also tweeted "I was wrong and we are gonna kill this track." Stay tuned.