--- a/includes/Linker.php
+++ b/includes/Linker.php
@@ -983,6 +983,9 @@ class Linker {
        public static function userLink( $userId, $userName, $altUserName = false ) {
                if ( $userId == 0 ) {
                        $page = SpecialPage::getTitleFor( 'Contributions', $userName );
+                       if ($altUserName === false) {
+                               $altUserName = IP::prettifyIP( $userName );
+                       }
                } else {
                        $page = Title::makeTitle( NS_USER, $userName );
                }