Nest Labs has recalled 440,000 smoke alarms in order to fix a bug that could prevent their alarms from sounding immediately after detecting smoke. Mercury News reports that the Nest Protect Smoke + Carbon Monoxide alarms are equipped with a feature that “allows users to temporarily silence some alerts by waving their arm near the unit.” There have been no reported incidents, but Google’s recent acquisition is currently sending out electronic updates to disable the feature in case of emergency.

Only Nest smoke alarms connected to the Internet and linked to a user account can receive the update. If you’d like to check and see if your device has received the update, head to “Nest Sense” on your account page and make sure the “Nest Wave” button is set to off. Nest ceased sales of the device shortly after the issue was discovered last month.