After stopping sales back in April, the Nest Protect smoke and carbon monoxide detector has been officially recalled, according to the U.S. Consumer Product Safety Commission.

More than 440,000 units have been sold in the United States. If you own a Protect, there are two different routes you can take.

First, if you’re able to connect the device to the Internet, a software update will automatically be downloaded. If you can’t do that, or want a refund, you can visit Nest’s site here to start the process.

The recall stems from an issue with the Nest Wave feature. While it was designed to allow users to quiet an alarm in the case of a nuisance event, like from cooking, Nest discovered a bigger flaw.

During the case of an actual fire emergency, movements near the detector could prevent it from going off. Thankfully, no incidents were reported because of the issue.

Nest, which was acquired by Google for $3.2 billion in cash in early 2014, rose to prominence with its Nest Thermostat. The Protect, which hit the market late last year, was lauded for reinventing the boring, but life-saving appliance.

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