U.S. stock index futures were lower Tuesday as oil retreated in one-year highs.

The Dow jones futures was lower .25% at 05:30 ET, as the S&P 500 futures shed .32%.

The tech-heavy Nasdaq futures was lower .27%.

U.S. crude dipped below $51 on profit-taking after 3% gains on Monday.

Apple (NASDAQ:AAPL) was up .7% in pre-market trade because it ongoing to profit from Samsung’s smartphone woes.

The dollar index was up .3% on bets of the U.S. rate hike this season.

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