diff --git a/phpBB/adm/style/admin.css b/phpBB/adm/style/admin.css
index a645ea7947..a6d29868ab 100644
--- a/phpBB/adm/style/admin.css
+++ b/phpBB/adm/style/admin.css
@@ -1747,14 +1747,14 @@ svg { /* TODO: remove it after general normalization */
 }
 
 .mention-item:hover,
-.mention-item.cur {
+.mention-item.is-active {
 	text-decoration: none;
 	background-color: #eeeeee;
 	color: #2d80d2;
 }
 
 .mention-item:hover .mention-media-avatar,
-.mention-item.cur .mention-media-avatar {
+.mention-item.is-active .mention-media-avatar {
 	color: #2d80d2;
 }
 
diff --git a/phpBB/assets/javascript/editor.js b/phpBB/assets/javascript/editor.js
index 2e726868bf..1e652cadea 100644
--- a/phpBB/assets/javascript/editor.js
+++ b/phpBB/assets/javascript/editor.js
@@ -616,7 +616,7 @@ function getCaretPosition(txtarea) {
 				trigger: '@',
 				allowSpaces: true,
 				containerClass: 'mention-container',
-				selectClass: 'cur',
+				selectClass: 'is-active',
 				itemClass: 'mention-item',
 				menuItemTemplate: function (data) {
 					const itemData = data;
diff --git a/phpBB/styles/prosilver/theme/colours.css b/phpBB/styles/prosilver/theme/colours.css
index 1c299b73ee..2499908b44 100644
--- a/phpBB/styles/prosilver/theme/colours.css
+++ b/phpBB/styles/prosilver/theme/colours.css
@@ -390,13 +390,13 @@ p.post-notice {
 }
 
 .mention-item:hover,
-.mention-item.cur {
+.mention-item.is-active {
 	background-color: #eeeeee;
 	color: #2d80d2;
 }
 
 .mention-item:hover .mention-media-avatar,
-.mention-item.cur .mention-media-avatar {
+.mention-item.is-active .mention-media-avatar {
 	color: #2d80d2;
 }