diff --git a/wp-includes/comment-functions.php b/wp-includes/comment-functions.php
index 243800abb8..a176085ed6 100644
--- a/wp-includes/comment-functions.php
+++ b/wp-includes/comment-functions.php
@@ -307,7 +307,7 @@ 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) ) .'">';
+		echo ' title="' . __( sprintf('Comment on %s', $post->post_title) ) .'">';
 		comments_number($zero, $one, $more, $number);
 		echo '</a>';
 	}