diff --git a/erpnext/selling/sales_common.js b/erpnext/selling/sales_common.js
index 80a6b7712fc..3470aee8d8c 100644
--- a/erpnext/selling/sales_common.js
+++ b/erpnext/selling/sales_common.js
@@ -428,6 +428,11 @@ erpnext.selling.SellingController = class SellingController extends erpnext.Tran
 			})
 		}
 	}
+
+	coupon_code() {
+		this.frm.set_value("discount_amount", 0);
+		this.frm.set_value("additional_discount_percentage", 0);
+	}
 };
 
 frappe.ui.form.on(cur_frm.doctype,"project", function(frm) {