McDonald’s Canada is recalling all four versions of its Shrek-themed drinking glasses after a mass recall south of the border.

Earlier Friday, McDonald’s in the U.S. recalled 12 million Shrek glasses because of cadmium in the painted design.

McDonald’s Canada said its recall was made “in an abundance of caution” following consultations with Health Canada.

It said the voluntary recall was made after it learned of the changing assessment of standards for cadmium in consumer products in the U.S.

McDonald’s Canada said the Shrek glassware was evaluated by an independent third-party laboratory and was fully in compliance with all applicable Canadian requirements when it was made and distributed.

Customers are instructed to stop using the glasses.

McDonald’s said information on how to return the glasses and get a refund will be released shortly.

The 16-ounce glasses were being sold as part of a promotional campaign for the movie Shrek Forever After.

The U.S. recall notice states “long-term exposure to cadmium can cause adverse health effects.” Cadmium is a known carcinogen that research shows also can cause bone softening and severe kidney problems.

In the case of the Shrek-themed glassware, the potential danger would be long-term exposure to low levels of cadmium, which could leach from the paint onto a child’s hand, then enter the body if the child puts that unwashed hand to his or her mouth.

“A very small amount of cadmium can come to the surface of the glass, and in order to be as protective as possible of children, [Consumer Product Safety Commission] and McDonald’s worked together on this recall,” said U.S. Consumer Product Safety Commission spokesman Scott Wolfson. He would not specify the amounts of cadmium that leached from the paint in tests, but said the amounts were “slightly above the protective level currently being developed by the agency.”