diff --git a/pandora_server/lib/PandoraFMS/Core.pm b/pandora_server/lib/PandoraFMS/Core.pm
index 8ac35fb8b7..9d6535807e 100644
--- a/pandora_server/lib/PandoraFMS/Core.pm
+++ b/pandora_server/lib/PandoraFMS/Core.pm
@@ -1794,6 +1794,7 @@ sub pandora_planned_downtime_monthly_start($$) {
 		FROM tplanned_downtime
 		WHERE type_periodicity = ?
 			AND executed = 0
+			AND type_execution <> ' . $RDBMS_QUOTE_STRING . 'once' . $RDBMS_QUOTE_STRING . '
 			AND ((periodically_day_from = ? AND periodically_time_from <= ?) OR (periodically_day_from < ?))
 			AND ((periodically_day_to = ? AND periodically_time_to >= ?) OR (periodically_day_to > ?))',
 			'monthly', 'number_day_month',