Canadian officials are warning travelers they may face entry restrictions when crossing into the United States because of differences in passport gender identifiers.

The issue stems from the use of an “X” gender identifier on Canadian passports, which could be unrecognizable to U.S. border officials, according to the Canadian Department of Global Affairs . Therefore, Canadian officials say they “cannot guarantee your entry or transit through other countries” including the U.S.

“You might face entry restrictions in countries that do not recognize the ‘X’ gender identifier,” the department explained on its website. “Before you leave, verify this information with the closest foreign representative for your destination.”

The Canadian government also notes that individuals may be asked to

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