The Supreme Court on Thursday made it easier for employees to seek religious accommodations in a case involving a lawsuit brought by an evangelical Christian mail carrier who asked not to work on Sundays.

The case involved a claim brought by a Pennsylvania man, Gerald Groff, who says the U.S. Postal Service could have granted his request that he be spared Sunday shifts based on his religious belief that it is a day of worship and rest.

His case will now return to lower courts for further litigation.

Groff argued that it was too difficult for employees to bring religious claims under Title VII of the Civil Rights Act, which prohibits workplace discrimination on various fronts, including religion.

The justices in a unanimous ruling written by conservative Justice Samuel Alito clarified a 1977 Supreme Court ruling called Trans World Airlines v. Hardison. The court said then that employers are not required to make accommodations if they would impose even a minimal or, using the Latin term preferred by the court, “de minimis,” burden.