Employers can legally pay women less than men for the same work based on differences in the workers’ previous salaries, a federal appeals court ruled Thursday.

The decision by the 9th U.S. Circuit Court of Appeals overturned a lower-court ruling that said pay differences based exclusively on prior salaries were discriminatory under the federal Equal Pay Act.

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“This decision is a step in the wrong direction if we’re trying to really ensure that women have work opportunities of equal pay,” said Deborah Rhode, who teaches gender equity law at Stanford Law School. “You can’t allow prior discriminatory salary setting to justify future ones or you perpetuate the discrimination.”