The 34-year-old "500 Days of Summer" star said he wants to make sure his son makes up his own mind about being in the public eye, something which comes with having a father who is famous, reported People magazine.
"Being in the public eye is a great thing. It allows me to do what I love to do, which is act in movies, but it's a choice that I made. I decided to have a career in show business, and so people know my name and know my face. And that has its upsides and honestly, some downsides," Joseph said.
"And so, for now, I'm just a protective dad, and I want to protect his privacy," he said.