Oil futures maintained gains to snap a three-session slide after another small rise in the number of U.S. rigs drilling for crude, but suffered a down week.

April West Texas Intermediate crude rose 26 cents, or 0.4%, to end at 61.25 a barrel on the New York Mercantile Exchange. That left the U.S. benchmark with a 3.6% weekly decline. The global crude benchmark, May Brent rose 54 cents, or 0.9%, to settle at $64.37 a barrel on the ICE Futures Europe exchange, trimming its weekly fall to 4%.

Oil held on to gains after oil-field services firm Baker Hughes said the number of rigs drilling for U.S. crude rose by one unit to 800 this week. The firm’s weekly data on the number of rigs drilling for oil in the U.S. is seen as a bellwether for activity in the sector.

Oil saw weakness in early action, attributed in part to President Donald Trump’s announcement Thursday that he would impose tariff on steel and aluminum imports, stoking fears of a global trade war and contributing to a global equity selloff.

But a weaker dollar appeared to help lift crude as the ICE U.S. Dollar Index a measure of the U.S. unit against a basket of six major rivals, fell by around 0.4%. The dollar and commodities priced in the currency often exhibit an inverse relationship. A weaker dollar makes oil cheaper to buyers using other currencies.

And while trade-war fears dented overall risk appetite, tariffs offer a reason to be bullish on crude, said Phil Flynn, senior market analyst at Price Futures Group, in a note. That is because the tariffs would raise the cost of production for crude given that steel is used in almost very part of the industry from production, refining and processing, and distribution of refined products. “This tariff, if put in place, should not derail global growth drastically so even at higher costs we should see demand stay strong. It will also reduce future oil production,” Flynn said. “That could change if we get into a full-fledged trade war but with so much to lose from our trading partners, I do not think that is going happen.”

A surge in North American crude output also has the market worried, despite efforts by the Organization of the Petroleum Exporting Countries and external producers such as Russia to limit global crude production.

On Wednesday, the U.S. Energy Information Administration reported that crude oil stockpiles rose by 3 million barrels in the week ended Feb. 23, a greater increase than anticipated by most analysts.