The U.S. Department of Agriculture removed the fictional nation of Wakanda from its list of free trade partners after reports revealed the inclusion of the fictional kingdom on Wednesday.

Francis Tseng, a research fellow at the Jain Family Institute, discovered the country that serves as the setting for the Marvel film "Black Panther" was included in the list while using the Agricultural Tariff Tracker that is maintained by the USDA's Foreign Agricultural Service.

"Wakanda is listed as a US free trade partner on the USDA website??" a dumbfounded Tseng tweeted upon making the discovery, along with a screenshot of his find.

The USDA explained in an email that the fictional country had been added during a test of the Tariff Tracker. The agency told USA TODAY that Wakanda had been included in the list since June.

"The Wakanda information should have been removed after testing and has now been taken down," an agency spokesman said.

The screenshots shared by Tseng listed the agricultural products traded with Wakanda, which primarily consisted of livestock.

Tseng joked that if Wakanda were real, the U.S. "would no doubt try to liberalize Wakanda's markets and flood it with cheap subsidized corn."

The USDA also joked about the incident in a tweet on Thursday.

"While we removed the Kingdom of Wakanda from our list of US free trade partners, our relationship will always be strong #WakandaForever," the tweet said.