diff --git a/erpnext/projects/doctype/timesheet/timesheet.js b/erpnext/projects/doctype/timesheet/timesheet.js
index 3eea390ff31..defc18bf4e9 100644
--- a/erpnext/projects/doctype/timesheet/timesheet.js
+++ b/erpnext/projects/doctype/timesheet/timesheet.js
@@ -258,7 +258,12 @@ var calculate_end_time = function(frm, cdt, cdn) {
 
 var update_billing_hours = function(frm, cdt, cdn){
 	var child = locals[cdt][cdn];
-	if(!child.billable) frappe.model.set_value(cdt, cdn, 'billing_hours', 0.0);
+	if(!child.billable) {
+		frappe.model.set_value(cdt, cdn, 'billing_hours', 0.0);
+	} else {
+		// bill all hours by default
+		frappe.model.set_value(cdt, cdn, "billing_hours", child.hours);
+	}
 };
 
 var update_time_rates = function(frm, cdt, cdn){