diff --git a/wp-includes/comment-template.php b/wp-includes/comment-template.php
index 8a75f73a84..58e8de83bc 100644
--- a/wp-includes/comment-template.php
+++ b/wp-includes/comment-template.php
@@ -1231,7 +1231,7 @@ class Walker_Comment extends Walker {
 ?>
 		<<?php echo $tag ?> <?php comment_class(empty( $args['has_children'] ) ? '' : 'parent') ?> id="comment-<?php comment_ID() ?>">
 		<?php if ( 'ul' == $args['style'] ) : ?>
-		<div id="div-comment-<?php comment_ID() ?>">
+		<div id="div-comment-<?php comment_ID() ?>" class="comment-body">
 		<?php endif; ?>
 		<div class="comment-author vcard">
 		<?php if ($args['avatar_size'] != 0) echo get_avatar( $comment, $args['avatar_size'] ); ?>