Add Saudi billionaire Prince Alwaleed to the growing list of skeptics who believe bitcoin is a house of cards that will tumble when the first winds of controversy blow.

“I just don’t believe in this bitcoin thing,” Alwaleed told CNBC in an interview on Monday. “I think it’s just going to implode one day. I think this is Enron in the making.”

Alwaleed told CNBC in an interview. “It just doesn’t make sense. This thing is not regulated, it’s not under control, it’s not under the supervision” of any central bank, he said.

Alwaleed’s comments but pressure on the cryptocurrency, helping push it down 3.9 percent in the hours after he opined. Bitcoin has been a tear this year, hitting a new high of over $6,150 last week — up from a 52-week low of $649.

The prince’s comments gained instant traction as he has had a knack for early-stage investing — as his bet on tech companies Twitter and AOL reveal.

Earlier this month, JPMorgan Chase Chief Executive Officer Jamie Dimon attacked bitcoin, calling it a “fraud.” Anyone at the bank who traded bitcoin would be fired, Dimon said.