Gillian Anderson says she had to fight to earn a fair wage for her return to The X-Files after TV executives initially offered the actress just half of what co-star David Duchovny was banking.
The actress reprises her role as FBI agent Dana Scully, opposite Duchovny's Fox Mulder, for the sci-fi series reboot, and says it took a lot of negotiation to get her pay increased to an acceptable level, despite the recent push for equal wages in Hollywood - a battle she had fought and won in the past.
"It was shocking to me, given all the work that I had done in the past to get us to be paid fairly," she tells The Daily Beast.
"I worked really hard toward that and finally got somewhere with it.
"Even in interviews in the last few years, people have said to me, 'I can't believe that happened, how did you feel about it? That is insane.' And my response always was, 'That was then, this is now."
"And then it happened again!" she exclaims. "I don't even know what to say about it... It is sad."TV bosses have yet to respond to Anderson's claims.
A new The X-Files mini-series is due to premiere on US network Fox on Sunday and on Australia's Network Ten on January 31 - 14 years after the original series ended.
The gender wage gap has been in the headlines for over a year after documents exposed during the Sony Pictures hacking scandal at the end of 2014 revealed Jennifer Lawrence and Amy Adams had been paid millions less than their male co-stars in American Hustle.
Boyhood star Patricia Arquette further thrust the issue into the spotlight during her acceptance speech at the 2015 Oscars, and Academy Award winner Lawrence subsequently penned a candid essay on the hot topic, revealing she blamed herself for not fighting for better pay.