Need mom advice for a climbing 1 year old..

Kimberly

So my boy just turned 11 months, and he has figured out how to climb my couch. I keep taking him down and say no, but he dont listen. Which i dont expect at his age. But what, if anything, can i do to stop him from climbing it? Or should i just let him? Im just afraid of him falling off even if im right next to him. The way my house is set up, i cant really block it off or use a baby gate.