Some 13 oz. bags of Lay's Classic Potato Chips may contain an undeclared allergen, according to the snack company.

According to an alert from the FDA, the affected snacks could contain undeclared milk allergens. Frito-Lay is recalling Lay’s Classic Potato Chips that “may contain undeclared milk,” posing a risk for individuals with milk allergies or sensitivities,

The Food and Drug Administration (FDA) announced on Wednesday (December 18) that Frito-Lay issued a recall on a “limited number” of the 13. oz bags of chips. These Lay’s Classic Potato Chips bags were recalled because they “may contain undeclared milk ,” which Frito-Lay learned “after being alerted through a consumer contact.”