diff --git a/app/javascript/styles/mastodon/components.scss b/app/javascript/styles/mastodon/components.scss
index d03ab03c23..0cde9f55c0 100644
--- a/app/javascript/styles/mastodon/components.scss
+++ b/app/javascript/styles/mastodon/components.scss
@@ -2528,7 +2528,7 @@ $ui-header-height: 55px;
     }
   }
 
-  .ui__header {
+  .layout-single-column .ui__header {
     display: flex;
     background: $ui-base-color;
     border-bottom: 1px solid lighten($ui-base-color, 8%);