diff --git a/erpnext/public/js/utils/sales_common.js b/erpnext/public/js/utils/sales_common.js
index 1d6daa5..5514963 100644
--- a/erpnext/public/js/utils/sales_common.js
+++ b/erpnext/public/js/utils/sales_common.js
@@ -369,6 +369,11 @@
 					}
 				}
 			}
+
+			coupon_code() {
+				this.frm.set_value("discount_amount", 0);
+				this.frm.set_value("additional_discount_percentage", 0);
+			}
 		};
 	}
 }