Stockpiling helped keep prices stable in April but tariff impacts are about to show up on store shelves across the country.

Walmart, the world’s largest retailer, warned that is not immune from President Donald Trump’s tariffs. It plans to raise prices on some items as Trump’s global trade war sends the company’s costs higher.

The retail giant said Trump’s import taxes remain too high to avoid passing along to shoppers, who could start paying more for some items as soon as late May.