Taco Bell’s boss will become the new CEO of Chipotle Mexican Grill, the fast-casual restaurant chain announced Tuesday.

Brian Niccol will replace Chipotle founder and CEO Steve Ells, effective March 5.

Ells will serve as executive chairman.

Chipotle has dealt with a slew of food-safety issues in recent years and last year, the long-awaited queso it added to its menu fell flat.

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