U.S. consumer prices fell for the first time in 10 months in March, weighed down by a decline in the cost of gasoline, but underlying inflation continued to firm amid rising prices for healthcare and rental accommodation.

The drop in the headline monthly inflation reading reported by the Labor Department on Wednesday is likely temporary as producer prices increased solidly in March.

In addition, the tightening labour market is expected to start generating significant wage inflation in the second half of the year. As such, many economists believe the Federal Reserve will raise interest rates three more times this year.

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The U.S. central bank increased borrowing costs last month and forecast at least two additional rate hikes in 2018.

“U.S. inflation is warming up rather than heating up,” said Sal Guatieri, a senior economist at BMO Capital Markets in Toronto. “Still, the upward trend could suffice to nudge the Fed three more times this year.”

The Consumer Price Index slipped 0.1 percent last month, the first and largest drop since May 2017, after climbing 0.2 percent in February, the Labor Department said.

Gasoline prices tumbled 4.9 percent in March, the largest drop since last May, after falling 0.9 percent in February. Food prices edged up 0.1 percent after being unchanged in February.

The core CPI was lifted by rising rents and healthcare costs. Owners’ equivalent rent of primary residence, which is what a homeowner would pay to rent or receive from renting a home, increased 0.3 percent last month after climbing 0.2 percent in February.

Healthcare costs shot up 0.4 percent, with prices for hospital care jumping 0.6 percent and the cost of doctor visits rising 0.2 percent. Healthcare costs increased 2.0 percent year-on-year, below the 2.9 percent average annual rate over the past 10 years.

Apparel prices fell 0.6 percent after two straight months of robust gains. There were also declines in the cost of telecommunication, used cars and trucks, tobacco and education.

Prices for new motor vehicles and recreation were unchanged last month.

In the 12 months through March, the CPI increased 2.4 percent. That was the largest annual gain in a year and followed February’s 2.2 percent increase. Annual inflation is rising as the big price declines from last year drop from the calculation.

Excluding the volatile food and energy components, the CPI climbed 0.2 percent, matching February’s increase.

The so-called core CPI rose 2.1 percent year-on-year in March, the largest advance since February 2017, after increasing 1.8 percent in February. The annual core CPI also accelerated as the drag from last year’s plunge in prices for cellphone service plans dropped out of the calculation.

The core CPI is now well above the 1.8 percent annual average increase over the past 10 years. Economists polled by Reuters had forecast the CPI unchanged in March and the core CPI rising 0.2 percent from the prior month.

The Fed tracks a different index, the personal consumption expenditures price index (PCE) excluding food and energy, which has consistently run below the central bank’s 2 percent target since mid-2012.