The Nintendo Co. Switch game console is shown during the company's launch event in New York in 2017.  (Kholood Eid/Bloomberg)

Nintendo has changed its warranty policies after the U.S. government warned it that it was violating the law.

The Japanese game company is one of six firms the Federal Trade Commission has told to change its policies because it wrongly told customers that using an unlicensed repair shop on its product voided its warranties. The agency expressed concern about stickers on products such as game consoles that had this information.

In Nintendo's case, a line in its policy specifically said using "products not sold or licensed by Nintendo" with its products would void the warranty.

In a statement, Nintendo of America said it has changed its policies after review. “We have updated our warranty text to clarify that Nintendo provides warranty service for defects not caused by the user or by other unauthorized acts," the statement said.

The FTC declined to comment. The agency said in April that it had sent letters to six unnamed companies. A later report from Motherboard revealed, through a Freedom of Information Act request, that those firms were Nintendo, Microsoft, Sony, HTC, Asus and Hyundai.

The letters said the agency would review the policies again in 30 days, and it reserved the right to pursue legal action and seek "appropriate" remedies.