A limited number of 13-ounce bags of Tostitos yellow corn tortilla chips were recalled by Frito-Lay in late March because of undeclared milk.

The Food and Drug Administration (FDA) announced it has elevated a recall it issued last month for one of its most popular chip brands due to an undeclared allergen. Frito-Lay initially issued the recall for 1,

The recall has now been upgraded to Class I, meaning “there is a reasonable probability” that eating the chips could “cause serious adverse health consequences or death”