Austin Nichols has mixed feelings about one of his earliest roles.

The actor recalled being reluctant to share an onscreen kiss with Mary-Kate Olsen in the 2001 film Holiday in the Sun given the six-year age difference between the two.

“I was definitely nervous because Mary-Kate was 15, and I was, I think, 18 or 19, or maybe even 20,” he said on the April 15 episode of the Drama Queens podcast. “I don’t remember, but I was too old, and it felt weird, and it felt wrong.”

While Austin, now 44, noted that audiences may not “notice” the age gap in the film—which also starred Mary-Kate’s twin sister Ashley Olsen—because he “looked very young” at the time, he couldn’t get past his own discomfort around kissing his much younger costar.

“I’m real tall and skinny and nerdy, but I don’t think you can tell there’s a big age difference,” he continued. “But my brain was like, ‘She’s 15, this is weird.’”