Earlier this month, Sprint started selling the HTC Bolt smartphone. It is one of the first such phones that has ditched the traditional 3.5mm headphone jack. While it comes with its own USB-C headphones that are supposed to offer adaptive audio features, the phone does not come with a USB-C to 3.5mm adapter. This meant that buyers who have a favorite set of wired headphones would have to spend extra money their own adapter … until now. HTC has decided to give Bolt owners a way to get a free adapter, if they are patient.

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If you have bought the Bolt from Sprint, you can go to the HTC Rewards site and type in the day you purchased the phone, along with its transaction number and its MEID number. HTC’s site says that it will begin shipping the USB-C to 3.5mm headphone adapter to those folks sometime by the end of December, but the site does warn that “there could be delays resulting from unforeseen inventory situations or high demand.” In other words, if you really, really need that adapter right now, you might be better off just getting one yourself.

The offer is for anyone who buys the HTC Bolt from Sprint from the day it went on sale until January 31, 2017, and those folks have until February 28, 2017 to take advantage of the free adapter promotion.