Mirizzi’s syndrome (MS) caused by the retention of a stone in the cystic duct stump after cholecystectomy is rare. Most cases of MS are treated by surgical intervention. However, developments of endoscopic accessories and techniques have resulted in the recent introduction of endoscopic treatments for MS. Furthermore, in view of the postoperative morbidity caused by post-operative scarring, the endoscopic approach should be preferred to the surgical approach. In the described case, the authors were able to remove a remnant cystic duct stone endoscopically because the cystic duct stump was wide and non-tortuous. This case shows endoscopic retrograde cholangiopancreatography with mechanical lithotripsy can be utilized in suitable cases of type I MS development after cholecystectomy.