Jessica Chastain is one of Hollywood’s most beloved actresses, so you’d think she wouldn’t have trouble being paid the same amount as her male counterparts — think again.

The Dark Zero Thirty star recently told Variety: “I’m not taking jobs anymore where I’m getting paid a quarter of what the male costar is being paid. I’m not allowing that in my life. What I do now, when I’m taking on a film, I always ask about the fairness of the pay. I ask what they’re offering me in comparison to the guy.”

She also admitted that in the past when she was offered a role, producers wouldn’t let her sign until they had secret a male lead, so they can budget accordingly to what his demands were. Whatever they’d have left over would ultimately decide her pay check.

“In the past, what I used to do—this is terrible—a movie would come to me with an offer,” she explained. “They wouldn’t want me to do my deal until they cast the male actor. They would wait and see what they had left over, even if they’d come to me first. And so I stopped doing that. Now, if someone comes to me and has an offer but wants to wait, I’m like, ‘Goodbye.’ If you want me in your film, do a favored-nation clause. Don’t determine my worth based on what’s left over.”

The star had a recent experience she was willing to share:

“There was something huge that I recently turned down,” she said. “For me, it wasn’t about the money; it was an old-fashioned problem of the wage gap. I turned it down, and they didn’t come back. I remember afterwards I was like, ‘What did I do? Maybe it was a mistake.’ But it wasn’t, because everyone in the studio system heard what I did…Even though I lost that film, I’ve created a boundary. I drew a line in the sand. The power of ‘no’ means you’re educating people in how to treat you.”