A 65-year-old man suffered an ischaemic stroke 2 months ago attributed to small-vessel disease. He is ambulatory with mild residual weakness. Blood pressure today is 150/92 mmHg, and LDL-C is 2.3 mmol/L. He is on aspirin 81 mg daily and an ACE inhibitor at moderate dose. According to Canadian secondary stroke prevention recommendations, which additional change is most appropriate?