President Donald Trump has extended his executive order banning US companies from working with or buying telecommunications equipment from companies deemed a national security risk until May 2021, via Reuters.

While the ban doesn’t explicitly call out specific companies, it’s been used to virtually shut down US operations with Chinese companies like Huawei, which can no longer sell products in the US or work with companies like Google or ARM for critical software and licenses.

The White House issued its original executive order almost a year ago, barring US companies from doing business with Huawei due to national security concerns about the Chinese firm supplying equipment for network infrastructure (particularly as the US undergoes its ongoing rollout for 5G).

But since the order was issued in May 2019, the full ban hasn’t actually taken effect yet. While Huawei hasn’t been able to work with companies like Google on new devices, the company has gotten a series of temporary general licenses from the Commerce Department that have allowed it to still support existing hardware with software updates.

That state of affairs may be about to change: after receiving extensions in May, August, November, and March, the most recent 45-day extension for the temporary license agreement is about to expire on May 15th. Neither Huawei nor the Commerce Department has indicated yet whether another extension of the temporary license will be granted.

Correction September 11th, 4:05pm: ZTE is not currently banned from business in the United States; it is still deemed a “threat to national security” by the FCC, which bars telecommunications providers from using government subsidy money to purchase ZTE equipment. This article originally included it alongside Huawei as being banned from US sales and licensing. We regret the error.