McDonald's has announced ingredient changes to its classic burgers.

The burgers have no artificial preservatives, no artificial flavors and no added colors from artificial sources, the company said Wednesday.

"The pickle contains an artificial preservative, and customers are able to skip it if they prefer," the company said in a news release.

The ingredient changes affect all 14,000 U.S. restaurants, "marking this the next major milestone in McDonald’s food journey and another way the company is helping customers feel good about the food they're enjoying." the company said.

The classic burgers include hamburgers, cheeseburgers, double cheeseburgers, McDoubles, Quarter Pounders with Cheese, double Quarter Pounders with Cheese and Big Macs.