diff --git a/modules/ticket/back/methods/sale/updateQuantity.js b/modules/ticket/back/methods/sale/updateQuantity.js
index 36d75ffed..4de1bcbd6 100644
--- a/modules/ticket/back/methods/sale/updateQuantity.js
+++ b/modules/ticket/back/methods/sale/updateQuantity.js
@@ -82,7 +82,7 @@ module.exports = Self => {
 
                 const message = $t('Changed sale quantity', {
                     ticketId: sale.ticket().id,
-                    changes: change,
+                    changes: JSON.stringify(change),
                     ticketUrl: `${url}ticket/${sale.ticket().id}/sale`,
                 });