diff --git a/erpnext/buying/doctype/purchase_order/purchase_order.js b/erpnext/buying/doctype/purchase_order/purchase_order.js
index eb0c230f6595c181f64113234225d7a0ecfdc181..7977fc618c4eb05c12163a8292d0663f8cf73c1b 100644
--- a/erpnext/buying/doctype/purchase_order/purchase_order.js
+++ b/erpnext/buying/doctype/purchase_order/purchase_order.js
@@ -304,9 +304,12 @@ erpnext.buying.PurchaseOrderController = class PurchaseOrderController extends e
 					}
 				}
 
-				if(is_drop_ship && doc.status!="Delivered") {
-					this.frm.add_custom_button(__('Delivered'),
-						this.delivered_by_supplier, __("Status"));
+				if (is_drop_ship && doc.status != "Delivered") {
+					this.frm.add_custom_button(
+						__("Delivered"),
+						this.delivered_by_supplier.bind(this),
+						__("Status")
+					);
 
 					this.frm.page.set_inner_btn_group_as_primary(__("Status"));
 				}