Ben Affleck just doesn’t think Angelina Jolie has the star power necessary to be a goodwill ambassador for the United Nations.

Affleck showed his trademark humor when he joked about Jolie’s participation at the press conference for his short movie, Gimme Shelter, in NYC on Wednesday.

“UNHCR has to find a goodwill ambassador who will get the attention of the press because the woman they’ve got is not high profile enough,” Affleck said.

Jolie, who has been the United Nations High Commissioner for Refugees goodwill ambassador since early 2001, has worked with field staff and met with refugees in more than 20 countries.

Like Jolie, Affleck has tried to use his star power to enlighten the public on important global causes.

“One of the things about being an actor is that I’ve had the opportunity to be exposed to really smart people,” he said. “People have been really generous. I expose myself to those people and say, ‘Help me learn about this,’ and I’ve given myself a great post-graduate experience in this arena.”

His film, a four-minute humanitarian campaign for victims of the fighting in Eastern Congo, is set to the Rolling Stone song of the same name.

Gala, Angelina Jolie traveled to the other side of the world for her first trip to war-torn Afghanistan.

Jolie, a Goodwill Ambassador for the United Nations Refugee Agency, met refugees who have returned to their post-Taliban homeland to rebuild their lives after fleeing in 2001. She also visited projects by Afghan Hands, an organization helping women and children, inspired by her work with refugees. “After seeing real suffering,” she tells PEOPLE, “you never complain anymore.”