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’s top grocery executive told employees in a memo on Tuesday that the online retailer needs to make more “deliberate choices” in order to win over customers.

The company announced a major shift in its grocery business that involves shuttering its Fresh supermarket and Go convenience chains. Some of those stores will be converted into Whole Foods locations.

Jason Buechel, Amazon’s vice president of Worldwide Grocery and Whole Foods CEO, told staffers that the company’s grocery business “delivered strong results” last year, but that it has to make some changes to its strategy to “build on this momentum.”

Buechel said Amazon is moving its grocery logistics unit to be within the broader worldwide operations division, which is overseen by Udit Madan, a senior vice president who is part of CEO Andy Jassy’s S-team. Viswanath Subramanian, who previously led grocery logistics, will move to a new role.