Add necessary arguments

comments.php

@@ -41,7 +41,12 @@ if ( post_password_required() ) {
 		<?php endif; // check for comment navigation ?>
 
 		<ol class="comment-list">
-			<?php wp_list_comments(); ?>
+			<?php
+				wp_list_comments( array(
+					'style'       => 'ol',
+					'short_ping'  => true
+				) );
+			?>
 		</ol><!-- .comment-list -->
 
 		<?php if ( get_comment_pages_count() > 1 && get_option( 'page_comments' ) ) : // are there comments to navigate through ?>