If you’re planning to buy Legos for the kids this holiday season, it’s time to start shopping. This week the Danish company announced that it cannot keep up with demand for its products in Europe — and it’s possible that shortage could affect the U.S. by December. Lego, which recently overtook Mattel and Hasbro to become the world’s largest toymaker, saw its popularity rise even higher after the success of last year’s The Lego Movie. The surge is similar to what happened in 2013, when Disney was caught off guard by the Frozen juggernaut and couldn’t make toys fast enough to satisfy its audience.