Index: src/includes/common/classes.php
===================================================================
--- src/includes/common/classes.php	(revision 5934)
+++ src/includes/common/classes.php	(working copy)
@@ -319,6 +319,7 @@
 
 		switch ( $args['style'] ) {
 			case 'div':
+			  echo "<div class='bbp-threaded-replies'>\n";
 				break;
 			case 'ol':
 				echo "<ol class='bbp-threaded-replies'>\n";
@@ -530,7 +531,7 @@
 		ob_start(); ?>
 
 		<option class="<?php echo esc_attr( $class ); ?>" value="<?php echo esc_attr( $value ); ?>"<?php selected( $args['selected'], $object->ID ); ?> <?php disabled( in_array( $reply_id, $ancestors ), true ); ?>><?php echo $pad . esc_html( $title ); ?></option>
-		
+
 		<?php
 
 		// Append the output buffer to the $output variable
Index: src/includes/replies/functions.php
===================================================================
--- src/includes/replies/functions.php	(revision 5934)
+++ src/includes/replies/functions.php	(working copy)
@@ -2417,7 +2417,7 @@
 	$r = bbp_parse_args( $args, array(
 		'walker'       => null,
 		'max_depth'    => bbp_thread_replies_depth(),
-		'style'        => 'ul',
+		'style'        => 'div',
 		'callback'     => null,
 		'end_callback' => null,
 		'page'         => 1,