diff --git a/htdocs/holiday/list.php b/htdocs/holiday/list.php
index b16fbaf8c16..cef7375a4b6 100644
--- a/htdocs/holiday/list.php
+++ b/htdocs/holiday/list.php
@@ -826,6 +826,9 @@ if ($resql) {
 			$starthalfday = ($obj->halfday == -1 || $obj->halfday == 2) ? 'afternoon' : 'morning';
 			$endhalfday = ($obj->halfday == 1 || $obj->halfday == 2) ? 'morning' : 'afternoon';
 
+			$nbopenedday = num_open_day($db->jdate($obj->date_debut, 1), $db->jdate($obj->date_fin, 1), 0, 1, $obj->halfday);	// user jdate(..., 1) because num_open_day need UTC dates
+			$totalduration += $nbopenedday;
+
 			if ($mode == 'kanban') {
 				if ($i == 0) {
 					print '<tr><td colspan="12">';