Singer Ellie Goulding is calling out music festivals for not having enough female performers.

The British singer-songwriter who has been a staple at major music fests for years, took to Twitter to call attention to the lack of female representation on festival stages.

“Still so proud as a female artist to be headlining and playing festivals around the world every single year,” she tweeted on Saturday. “Need to give myself credit sometimes as I’ve been doing this nonstop for over seven years. I don’t see many females at these festivals.”

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Goulding is fresh off a performance at last week’s Glatonbury Festival in the UK.

She shared a photo of herself on stage at a festival, writing, “I’ll keep doing what I do.”

It isn’t the first time Goulding, 30, has called out a festival for its lack of female performers.

In a 2015 interview with Cosmopolitan, she said, “I got annoyed when Glastonbury had so many men on the line-up.” This year, Katy Perry made her headlining debut at the festival.

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But it’s not just Glastonbury that has a problem.

The Huffington Post found that female performers made up only 12 per cent of festival acts in 2016. Last year, Coachella had zero female headliners and out of 168 acts, only 60 were either of mixed gender groups or female-only performers. Chicago’s long-running Lollapalooza had 47 female acts versus 124 male acts in its 2016 line-up.

Festival organizers seem to be aware of the lack of female representation.

“We’re very aware of the gender imbalance,” Chris Sampson, Executive Vice President of Programming at the company behind Bonnaroo. “We try to book the best festival that we can every year. We want the best artists out there, at every level, male or female,” he told The Huffington Post.