diff --git a/db/routines/vn/views/ticketPreviousPreparingList.sql b/db/routines/vn/views/ticketPreviousPreparingList.sql
index 9c84b8af3..cd18b3a7c 100644
--- a/db/routines/vn/views/ticketPreviousPreparingList.sql
+++ b/db/routines/vn/views/ticketPreviousPreparingList.sql
@@ -20,7 +20,7 @@ FROM (
 								`vn`.`saleGroup` `sg`
 								JOIN `vn`.`saleGroupDetail` `sgd` ON(`sgd`.`saleGroupFk` = `sg`.`id`)
 							)
-							JOIN `vn`.`sale` `s` ON(`s`.`id` = `sgd`.`saleFk`)
+							JOIN `vn`.`sale` `s` FORCE INDEX (PRIMARY) ON(`s`.`id` = `sgd`.`saleFk`)
 						)
 						JOIN `vn`.`ticketState` `tls` ON(`tls`.`ticketFk` = `s`.`ticketFk`)
 					)