Prior to the advent of the Haemophilus influenzae type b vaccine, invasive infections due to H. influenzae type f were rarely described. However, the epidemiology of H. influenzae is changing. While the incidence of invasive infections due to H. influenzae is declining in children, such infections are becoming more common in adults, particularly in the elderly. Here, we report an unusual case of infective aortic aneurysm caused by H. influenzae type f that underlines the emerging clinical relevance and pathogenic capability of this organism.