diff --git a/auth/mnet/auth.php b/auth/mnet/auth.php
index 3359b554283..8ecf7042c58 100644
--- a/auth/mnet/auth.php
+++ b/auth/mnet/auth.php
@@ -1006,7 +1006,7 @@ class auth_plugin_mnet extends auth_plugin_base {
      */
     function prelogout_hook() {
         global $MNET, $CFG, $USER;
-        if ($USER->auth != 'mnet') {
+        if (!is_enabled_auth('mnet')) {
             return;
         }