diff --git a/erpnext/projects/doctype/timesheet/timesheet.js b/erpnext/projects/doctype/timesheet/timesheet.js
index 168b891e98c..4c78d939ebc 100644
--- a/erpnext/projects/doctype/timesheet/timesheet.js
+++ b/erpnext/projects/doctype/timesheet/timesheet.js
@@ -296,6 +296,7 @@ frappe.ui.form.on("Timesheet Detail", {
 
 	hours: function (frm, cdt, cdn) {
 		calculate_end_time(frm, cdt, cdn);
+		update_billing_hours(frm, cdt, cdn);
 		calculate_billing_costing_amount(frm, cdt, cdn);
 		calculate_time_and_amount(frm);
 	},