diff --git a/mail/templates/pixelegg/app.css b/mail/templates/pixelegg/app.css
index 89e216ccf7..6ac9a702eb 100755
--- a/mail/templates/pixelegg/app.css
+++ b/mail/templates/pixelegg/app.css
@@ -2335,6 +2335,7 @@ div.mailPreviewHeaders div.mail_extraEmails {
   max-width: 50%;
   overflow: hidden;
   text-overflow: ellipsis;
+  white-space: nowrap;
 }
 div.mailPreviewHeaders div.mail_extraEmails img.et2_button_icon {
   width: 24px;
diff --git a/mail/templates/pixelegg/app.less b/mail/templates/pixelegg/app.less
index 617f425c6f..af9c5c470d 100755
--- a/mail/templates/pixelegg/app.less
+++ b/mail/templates/pixelegg/app.less
@@ -1211,6 +1211,7 @@ div.mailPreviewHeaders div.mail_extraEmails {
 	max-width: 50%;
 	overflow: hidden;
 	text-overflow: ellipsis;
+	white-space: nowrap;
 	img.et2_button_icon {
 		.dimension_width_height_m;
 	}