diff --git src/wp-includes/comment.php src/wp-includes/comment.php
index 7398f99..c7e64f3 100644
--- src/wp-includes/comment.php
+++ src/wp-includes/comment.php
@@ -1649,7 +1649,7 @@
 	if ( isset($_COOKIE['comment_author_email_'.COOKIEHASH]) )
 		$comment_author_email = $_COOKIE['comment_author_email_'.COOKIEHASH];
 
-	$comment_author_url = '';
+	$comment_author_url = 'https://';
 	if ( isset($_COOKIE['comment_author_url_'.COOKIEHASH]) )
 		$comment_author_url = $_COOKIE['comment_author_url_'.COOKIEHASH];