Matt Damon wasn’t exactly ready for this kind of downsizing. 

Indeed, the Good Will Huntingstar—who shares daughters Alexia Barroso, 26, Isabella, 18, Gia, 16, and Stella, 13, with wife Luciana Damon—recently detailed the changes his family is going through since Isabella headed to college. 

“We have a 26-year-old, so we’ve been through this once before but it’s still a major adjustment for us and for her sisters,” he explained to E! News at Stella Artois’ Let’s Do Dinner event in New York Sept. 19. “It’s a different household with one less person there. So, it’s a big adjustment.”

And Matt had previously opened up on his nervousness toward sending Isabella off to school. 

“It’s a lot,” he admitted to E! News of anticipating his daughter leaving the nest in July. “It’s a surreal kind of time and the way it operates in your life, the older you get, because it just feels like I was holding her yesterday.”