diff --git a/zephyr/static/js/ui.js b/zephyr/static/js/ui.js
index 5c7f34fbb5..7b2a322a4c 100644
--- a/zephyr/static/js/ui.js
+++ b/zephyr/static/js/ui.js
@@ -946,7 +946,7 @@ $(function () {
     $("#home").on("click", ".narrows_by_subject", function (e) {
         var nearest = current_msg_list.get(rows.id($(this).closest(".recipient_row")));
         var selected = current_msg_list.selected_message();
-        if (util.same_stream_and_subject(nearest, selected)) {
+        if (util.same_recipient(nearest, selected)) {
             narrow.by_subject(selected.id);
         } else {
             narrow.by_subject(nearest.id);