The December producer price index fell 0.2% and the core rate rose 0.1%, the Labor Department reported Tuesday.
The November numbers were unrevised from the originally reported 0.8% drop in the headline number and a 0.1% rise in the core rate.
Economists polled by Thomson Reuters expected a 0.1% dip in the headline number and a 0.2% core increase.
Food prices fell 0.9% in the month, while energy prices slid 0.3%.
Intermediate goods gained 0.3%, while core intermediate goods prices were up 0.2%.