diff --git a/lib/comments.php b/lib/comments.php
index ad1a87b..70a51fc 100644
--- a/lib/comments.php
+++ b/lib/comments.php
@@ -7,7 +7,7 @@
 class Roots_Walker_Comment extends Walker_Comment {
   function start_lvl(&$output, $depth = 0, $args = array()) {
     $GLOBALS['comment_depth'] = $depth + 1; ?>
-    <ul <?php comment_class('media unstyled comment-' . get_comment_ID()); ?>>
+    <ul <?php comment_class('media list-unstyled comment-' . get_comment_ID()); ?>>
     <?php
   }