diff --git a/lib/moodlelib.php b/lib/moodlelib.php
index dced08052dc..4dee21541bc 100644
--- a/lib/moodlelib.php
+++ b/lib/moodlelib.php
@@ -2562,7 +2562,7 @@ function truncate_userinfo($info) {
 function guest_user() {
     global $CFG;
 
-    if ($newuser = get_record('user', 'username', 'guest')) {
+    if ($newuser = get_record('user', 'username', 'guest', 'mnethostid',  $CFG->mnet_localhost_id)) {
         $newuser->confirmed = 1;
         $newuser->lang = $CFG->lang;
         $newuser->lastip = getremoteaddr();