U.S. stock prices will keep falling, as much as 15 percent, and that will push the Federal Reserve to continue its quantitative easing, says investment guru Marc Faber, editor of The Gloom, Boom & Doom Report.

The Fed’s current easing program – QE2 – is scheduled to end June 30. But the Fed may go all the way up to QE18, Faber quipped on CNBC.

U.S. stocks dropped earlier this week before rallying Thursday, thanks to Japan’s disaster, but the decline isn’t over, Faber says. He actually views the move as a healthy correction to the near doubling of stock prices from their March 2009 lows.

Marc Faber

"We may drop 10 to 15 percent,” Faber says. “Then QE2 will come, then QE4, QE5, QE6, QE7, whatever you want. The money printer will continue to print, that I'm sure." Later he added, "Actually I made a mistake. I meant to say QE18."

Faber is none too impressed with Fed Chairman Ben Bernanke. "I think Mr. Bernanke doesn't know much about the global economy, but he probably watches the S&P every day," Faber said.

Others are bearish on U.S. stocks too. “The risks have risen and you have to be mindful of them,” David Joy, chief market strategist at Columbia Management, tells Bloomberg.

In addition to Japan’s nuclear disaster, “there’s ongoing housing weakness in the U.S. and a fear premium built into the oil market.”