diff --git a/build/media_source/templates/administrator/atum/scss/blocks/_header.scss b/build/media_source/templates/administrator/atum/scss/blocks/_header.scss
index 3da646e3b75cd..aafdf4ceaf7d3 100644
--- a/build/media_source/templates/administrator/atum/scss/blocks/_header.scss
+++ b/build/media_source/templates/administrator/atum/scss/blocks/_header.scss
@@ -231,9 +231,6 @@
 
 @if $enable-dark-mode {
   @include color-mode(dark) {
-    .header-item-content:not(.joomlaversion) {
-      border: map-get($atum-colors-dark, "atum-btn-primary-border");
-    }
     .header-item-icon > * {
       background: var(--header-bg);
     }