A defective part may not allow some epinephrine injection devices to properly function, which could cause a life-threatening risk to users, according to the U.S. Food and Drug Administration.

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Although the number of reported failures is small, Meridien Medical Technologies is voluntarily recalling 13 lots of its Mylan’s EpiPen and EpiPen Jr manufactured between Dec. 17, 2015, and July 1, 2016.

Consumers should keep and use their EpiPen until they have a replacement.

Consumers who have EpiPens made other than those dates do not need to replace it before its expiration.