Industrial prices were down 0.2% on the month in December, after a 0.9% decline in November.
Prices in the mining industry dropped 1.3% on the month in December, while manufacturing and energy sector prices were 0.2% lower, the data showed.
Utility prices were unchanged in December from the previous month.
Compared with December 2011, industrial prices rose 4.9%, boosted by higher prices in most sectors, the data showed.
Prices in the utilities sector were up 6.5% in December 2012 from the year-earlier period, while manufacturing and energy prices rose by 5.6% and 2.4%, respectively. Mining prices fell 0.7% on the year in December.