Ruptured gastric artery aneurysm is a rare cause for upper gastrointestinal hemorrhage and should be considered if intraluminal causes are ruled out. We present a case of an 84 years old patient who presented with loss of consciousness following severe hematemesis. Oesophagogastro-duodenoscopy reveals Forrest type 1A actively bleeding peptic ulcer at D1 of the duodenum. An urgent mesenteric computer tomography scan and conventional angiography revealed an actively bleeding right gastric artery aneurysm, which was successfully treated with embolization.