It’s been exactly a month since the world shifted after hearing about the tragic passing of Chadwick Boseman and we are continuing to hear stories about how much of a great man he really was.

In an interview with Empire, Boseman’s 21 Bridges co-star, Sienna Miller, opened up about a time where the late actor used part of his own salary to ensure that she would be paid fairly. “This was a pretty big budget film, and I know that everybody understands about the pay disparity in Hollywood, but I asked for a number that the studio wouldn’t get to,” she recalled.

“And because I was hesitant to go back to work and my daughter was starting school and it was an inconvenient time, I said, ‘I’ll do it if I’m compensated in the right way,’” Miller continued. “And Chadwick ended up donating some of his salary to get me to the number that I had asked for. He said that that was what I deserved to be paid.”

The actress said that Boseman’s act of kindness was “about the most astounding thing that I’ve experienced.” She never spoke about what he did publicly, but Miller did share how Boseman helped her privately to her male friends.

“It’s just unfathomable to imagine another man in that town behaving that graciously or respectfully,” she said. “In the aftermath of this, I’ve told other male actor friends of mine that story and they all go very, very quiet and go home and probably have to sit and think about things for a while.”

Boseman, who passed away last month from colon cancer, served as a producer on the film. Miller says he was “active” in trying to get her to star in the movie as Frankie, which was a role originally made for a male. “He was a fan of my work, which was thrilling, because it was reciprocated from me to him, tenfold,” she said.