diff --git a/booking.helper.inc b/booking.helper.inc
index d45f5db..763326a 100644
--- a/booking.helper.inc
+++ b/booking.helper.inc
@@ -257,7 +257,7 @@ function _booking_get_waitinglist()
 	$query->condition($db_and)
 		->fields('p')
 		->fields('y')
-		->orderBy('p.booking_status')->orderBy('p.booking_payment_date');	
+		->orderBy('p.booking_status')->orderBy('y.booking_payment_date');	
 	$definition_result = $query->execute();	
 
 	watchdog('booking_debug', "<pre>_booking_get_waitinglist\n@info</pre>", array('@info' => print_r( $definition_result, true)));