diff --git a/erpnext/buying/doctype/purchase_order/purchase_order.js b/erpnext/buying/doctype/purchase_order/purchase_order.js
index 33c41c5bf4e7f038d5e6a85a931dc7afcf3d3d95..ac3547a4c9c2e58e480dec46d8038825b01be5bc 100644
--- a/erpnext/buying/doctype/purchase_order/purchase_order.js
+++ b/erpnext/buying/doctype/purchase_order/purchase_order.js
@@ -366,7 +366,11 @@ erpnext.buying.PurchaseOrderController = class PurchaseOrderController extends (
 				}
 
 				if (is_drop_ship && doc.status != "Delivered") {
-					this.frm.add_custom_button(__("Delivered"), this.delivered_by_supplier, __("Status"));
+					this.frm.add_custom_button(
+						__("Delivered"),
+						this.delivered_by_supplier.bind(this),
+						__("Status")
+					);
 
 					this.frm.page.set_inner_btn_group_as_primary(__("Status"));
 				}