An arbitration clause at Sunoco Inc. that calls for workers to submit disputes to “binding arbitration” is unenforceable because it uses ambiguous language that could be read to mean that arbitration is merely an option, a federal judge has ruled.

In his 14-page opinion in Hudyka v. Sunoco Inc., Eastern District of Pennsylvania Judge Timothy J. Savage refused to compel arbitration of an age discrimination suit after finding that the company’s arbitration clause did not make it clear that arbitration was mandatory.