diff --git a/res/css/views/messages/_DateSeparator.scss b/res/css/views/messages/_DateSeparator.scss
index 93a61e2de0a..a1672c7279b 100644
--- a/res/css/views/messages/_DateSeparator.scss
+++ b/res/css/views/messages/_DateSeparator.scss
@@ -27,6 +27,7 @@ limitations under the License.
     flex: 1 1 0;
     height: 0;
     border: none;
+    border-bottom: 1px solid $menu-selected-color;
 }
 
 .mx_DateSeparator > div {