Senning procedure involves creating a network of baffles from the flaps raised from right atrium and native atrial septum so that inferior vena cava and superior vena cava flow is redirected to the mitral valve and pulmonary venous blood flow is redirected to the tricuspid valve. We describe a case of leak across the Senning baffle and the associated characterization on intraoperative transesophageal echocardiography.