In the Marvel universe, Wakanda is the fictional East African home country of superhero Black Panther.

A spokesperson for the department said the Kingdom of Wakanda was accidentally added to the list during a staff test.

The department’s online tariff tracker contained an extensive and detailed list of goods which the two nations apparently traded, including ducks, donkeys and dairy cows, the BBC reports.

Wakanda was soon removed from the list after US media outlets first queried it, leading to jokes that the countries had started a trade war.