diff --git a/static/js/stream_list.js b/static/js/stream_list.js
index 549cec847b..5355f6b1d6 100644
--- a/static/js/stream_list.js
+++ b/static/js/stream_list.js
@@ -120,7 +120,7 @@ function reset_to_unnarrowed(narrowed_within_same_stream) {
         zoom_out();
     }
 
-    $("ul.filters li").removeClass('active-filter active-subject-filter');
+    $("ul.filters li").removeClass('active-filter active-sub-filter');
     remove_expanded_subjects();
 }
 
@@ -312,7 +312,7 @@ function rebuild_recent_subjects(stream, active_topic) {
     stream_li.append(topic_dom);
 
     if (active_topic) {
-        get_subject_filter_li(stream, active_topic).addClass('active-subject-filter');
+        get_subject_filter_li(stream, active_topic).addClass('active-sub-filter');
     }
 }
 
diff --git a/static/styles/zulip.css b/static/styles/zulip.css
index 2c8b536a6c..0a8bc60c31 100644
--- a/static/styles/zulip.css
+++ b/static/styles/zulip.css
@@ -374,7 +374,7 @@ a:hover code {
     background-color: #e2e8dd;
 }
 
-#stream_filters li.active-subject-filter:hover {
+#stream_filters li.active-sub-filter:hover {
     background-color: #ccd6cc;
 }
 
@@ -483,7 +483,7 @@ ul.filters hr {
 }
 
 li.active-filter,
-li.active-subject-filter {
+li.active-sub-filter {
     font-weight: 600;
     background: #ddedf6;
     position: relative;