President Donald Trump on Wednesday signed an executive order ending the de minimis trade loophole for low-value packages shipped from all countries.

The order, which takes effect Aug. 29, will subject any shipments of imported goods into the U.S. worth $800 or less to duties, the White House said.

Any goods shipped through the international postal network will be subject to tariff rates based on the value of the package and its country of origin.

The move comes after Trump in May shuttered the de minimis loophole for goods from China and Hong Kong. A federal trade court on Monday declined to block Trump’s de minimis ban, even after an auto parts retailer argued the action was unlawful and threatened its business.

Use of the de minimis provision has exploded in recent years as online shopping has become more prevalent. Ultra-cheap online retailers such as Temu and Shein have used the loophole to ship packages to American shoppers directly from China duty-free.

Shares of PDD Holdings, the parent company of Temu, dipped lower following the announcement.

The Trump administration has sought to close the loophole, calling it a “big scam” that hurts U.S. businesses. Officials have said de minimis facilitates shipments of fentanyl and other illicit substances, saying the packages are less likely to be inspected by customs agents.

The volume of de minimis shipments has skyrocketed to 309 million units so far this fiscal year, up from 115 million for all of last year, the White House said.

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