diff --git a/erpnext/manufacturing/doctype/work_order/work_order.js b/erpnext/manufacturing/doctype/work_order/work_order.js
index d14c8d82f11..f9c028563bb 100644
--- a/erpnext/manufacturing/doctype/work_order/work_order.js
+++ b/erpnext/manufacturing/doctype/work_order/work_order.js
@@ -611,7 +611,7 @@ erpnext.work_order = {
 				description: __('Max: {0}', [max]),
 				default: max
 			}, data => {
-				max += (max * (frm.doc.__onload.overproduction_percentage || 0.0)) / 100;
+				max += (frm.doc.qty * (frm.doc.__onload.overproduction_percentage || 0.0)) / 100;
 
 				if (data.qty > max) {
 					frappe.msgprint(__('Quantity must not be more than {0}', [max]));