diff --git a/wp-includes/comment-template.php b/wp-includes/comment-template.php
index 1ed1dd6b3..6355a9624 100644
--- a/wp-includes/comment-template.php
+++ b/wp-includes/comment-template.php
@@ -366,7 +366,8 @@ function comments_popup_link($zero='No Comments', $one='1 Comment', $more='% Com
 	if (!empty($CSSclass)) {
 		echo ' class="'.$CSSclass.'"';
 	}
-	echo ' title="' . sprintf( __('Comment on %s'), $post->post_title ) .'">';
+	$title = wp_specialchars(apply_filters('the_title', get_the_title()));
+	echo ' title="' . sprintf( __('Comment on %s'), $title ) .'">';
 	comments_number($zero, $one, $more, $number);
 	echo '</a>';
 }