NEW YORK (CNN/Money) - Printer maker Lexmark International warned late Thursday that current-quarter profits will likely fall below Wall Street forecasts but said earnings in its December quarter beat expectations.

Shares of Lexmark fell $3.26, or 5 percent, to $63 in after-hours trading. Losses spread to rival Hewlett-Packard (HPQ: Research, Estimates), which fell 28 cents to $20.20.

Lexmark (LXK: Research, Estimates), based in Lexington, Ky., said profits in its December quarter will come in at 88 to 90 cents per share, topping the 77 cent per share consensus forecast of analysts surveyed by First Call. The results include a 3 cent benefit related to restructuring, Lexmark said.

But the printer maker said that first-quarter profit will come in at 62 to 72 cents per share, possibly missing the 72 cent per share consensus forecasts.

Lexmark offered no explanation for the probable miss and said it would "have no further comment " until Jan. 23, when the company reports detailed fourth-quarter results.