diff --git a/wp-comments-post.php b/wp-comments-post.php
index e0d95a4055..e2ccba6af9 100644
--- a/wp-comments-post.php
+++ b/wp-comments-post.php
@@ -53,11 +53,11 @@ wp_new_comment( $commentdata );
 if ( !$user_ID ) :
 	setcookie('comment_author_' . COOKIEHASH, stripslashes($comment_author), time() + 30000000, COOKIEPATH, COOKIE_DOMAIN);
 	setcookie('comment_author_email_' . COOKIEHASH, stripslashes($comment_author_email), time() + 30000000, COOKIEPATH, COOKIE_DOMAIN);
-	setcookie('comment_author_url_' . COOKIEHASH, stripslashes($comment_author_url), time() + 30000000, COOKIEPATH, COOKIE_DOMAIN);
+	setcookie('comment_author_url_' . COOKIEHASH, stripslashes(clean_url($comment_author_url)), time() + 30000000, COOKIEPATH, COOKIE_DOMAIN);
 endif;
 
 $location = ( empty( $_POST['redirect_to'] ) ) ? get_permalink( $comment_post_ID ) : $_POST['redirect_to']; 
 
 wp_redirect( $location );
 
-?>
\ No newline at end of file
+?>