The company behind EpiPen and EpiPen Jr. is voluntarily recalling some of its products due to a defect that may keep the lifesaving devices from working.

On Friday, the U.S. Food and Drug Administration alerted the public to Meridian Medical Technologies' voluntary recall of 13 lots of the EpiPen and EpiPen Jr. Auto-Injector Products because of a defective part.

The devices, distributed by Mylan Specialty and used as an emergency treatment of severe allergic reactions, are being recalled because the defect may prevent the devices from activating.

So far, 13 lots distributed between Dec. 17, 2015 and July 1, 2016 have been identified and are the only lots impacted by the recall and will need to be replaced.