CHICAGO - McDonald's said Thursday its french fries are now trans-fat-free in all its restaurants in the United States and Canada, catching it up with its fast-food rivals in that category.

CEO Jim Skinner made the word official at its annual shareholders meeting at McDonald's Corp. headquarters in Oak Brook, Ill.

McDonald's has lagged behind other restaurant operators in switching over to a zero-trans-fat cooking oil out of worries it would compromise the taste of its trademark fries. It has been under increasing pressure from consumer advocates and some public officials to make the change, but did so quietly.

"For a few months now, customers in our U.S. restaurants have been enjoying our fried food items, including french fries, hash browns, chicken and filet of fish, as well as our biscuits, with zero grams of trans fat per labelled serving,'' Skinner said.

He said McDonald's is on schedule to convert to the new oil by year's end for its remaining baked items, pies and cookies.

"While we don't plan to advertise these changes, we wanted you to be the first to know that we have followed through on our commitment while keeping the same great taste that our customers expect from McDonald's,'' Skinner said.

The US$23 billion company was especially cautious in making the switch after reneging within months on a September 2002 pledge to introduce a new oil, citing the taste concerns.