diff --git a/assets/js/src/newsletters/campaign_stats/newsletter_general_stats.tsx b/assets/js/src/newsletters/campaign_stats/newsletter_general_stats.tsx
index d1744e05c6..fe6d33ec32 100644
--- a/assets/js/src/newsletters/campaign_stats/newsletter_general_stats.tsx
+++ b/assets/js/src/newsletters/campaign_stats/newsletter_general_stats.tsx
@@ -67,7 +67,7 @@ export const NewsletterGeneralStats = ({
           MailPoet.I18n.t('percentageMachineOpenedTooltip'),
           /\[link](.*?)\[\/link]/,
           (match) => (
-            <span style={{ pointerEvents: 'all' }}>
+            <span style={{ pointerEvents: 'all' }} key="machine-opened-tooltip">
               <a
                 href="https://kb.mailpoet.com/article/368-what-are-machine-opens"
                 key="kb-link"