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A North African boy, the son of consanguineous parents, presented at 8 years of age with hypophosphataemic rickets due to De Toni–Debré–Fanconi syndrome. Hepatomegaly and abnormalities of carbohydrate metabolism were suggestive of Fanconi–Bickel syndrome. This was confirmed by the detection of a mutation within GLUT2, the gene encoding the liver‐type facilitative glucose transporter. The study of the respiratory chain revealed a deficiency of complexes I, III and IV in muscle. Mechanisms responsible for an impairment of mitochondrial function, which we interpret as a secondary phenomenon, are discussed.