The U.S. Food and Drug Administration (FDA) has elevated the risk classification for a nationwide butter recall, now labeling it a Class II recall — the second-highest warning level —due to a potential undeclared allergen.

Bunge North America recalled more than 64,000 pounds of its NH European Style Butter Blend due to potential undeclared milk allergens, the FDA said.

Over 64,000 pounds of butter have been recalled by the FDA due to allergen concerns. See which products were affected—and why.