diff --git a/web/styles/zulip.css b/web/styles/zulip.css
index 3b873b2940..859c89fa42 100644
--- a/web/styles/zulip.css
+++ b/web/styles/zulip.css
@@ -3028,6 +3028,8 @@ select.invite-as {
     .message_row.unread {
         .date_row {
             position: relative;
+            border-left: 1px solid var(--color-message-list-border);
+            left: -1px;
             /* Needs to be lower than the z-index of message_header. */
             z-index: 3;
         }