diff --git a/erpnext/projects/doctype/time_log/time_log.js b/erpnext/projects/doctype/time_log/time_log.js
index 7b2faf9d2b..3a01ca5de0 100644
--- a/erpnext/projects/doctype/time_log/time_log.js
+++ b/erpnext/projects/doctype/time_log/time_log.js
@@ -46,7 +46,7 @@ frappe.ui.form.on("Time Log", "before_save", function(frm) {
 frappe.ui.form.on("Time Log", "to_time", function(frm) {
 	if(frm._setting_hours) return;
 	frm.set_value("hours", moment(cur_frm.doc.to_time).diff(moment(cur_frm.doc.from_time),
-		"minutes") / 60);
+		"seconds") / 3600);
 
 });