Shares of Dell and HP fell on Wednesday after the personal computer makers issued forecasts that cast doubt on a market recovery driven by artificial intelligence-enabled PCs.

Dell Technologies shares fell 10% in after-trading after the company estimated Q4 revenue and earnings to fall below initial expectations.

Dell forecast fourth-quarter revenue below Wall Street expectations on Tuesday, weighed down by weaker demand for its traditional PCs and competition from rival server makers, sending its shares down more than 10% in extended trading.

Dell Technologies stock tumbled late Tuesday after the tech hardware company reported mixed fiscal third quarter results. Dell said in a news release that it earned an adjusted $2.15 per share on sales of $24.