Urine as a cause of ascites is relatively unusual. This occurs when urine leaks into the peritoneal cavity as a result of bladder rupture. Bladder ruptures are commonly due to traumatic injuries but may also occur spontaneously, specially among alcoholics. The diagnosis of urinary ascites secondary to bladder rupture is usually missed at first and proper management is delayed. Here we describe a young male patient who consulted our hospital because of abdominal distension and difficult micturation. His ascites was mistakenly assumed to be of hepatic origin. Laparotomy demonstrated a tear at the bladder dome. Retrospective analysis of the previous ascitic fluid showed high creatinine levels, confirming the ascitic fluid to be urine.