The U.S. stock market is opening slightly lower following its best day in a month.

Apple fell 1 percent after the company pulled a software update for its iPhones late Wednesday after users complained that they weren't able to make calls.

The Dow Jones industrial average fell 42 points, or 0.2 percent, to 17,171 as of 9:35 a.m. Eastern time Thursday. The Dow gained 154 points the day before.

The Standard & Poor's 500 index fell five points, or 0.3 percent, to 1,993. The Nasdaq composite fell nine points, or 0.2 percent, to 4,545.

Bond prices rose. The yield on the 10-year Treasury note fell to 2.54 percent from 2.57 percent late Wednesday.