diff --git a/login/change_password.php b/login/change_password.php
index f4015430ad5..f26f19273ba 100644
--- a/login/change_password.php
+++ b/login/change_password.php
@@ -71,7 +71,8 @@
             }
 
             // register success changing password
-            unset_user_preference('auth_forcepasswordchange', $user);
+            // echo "<pre>"; print_r( $user ); print_r( $USER ); die;
+            unset_user_preference('auth_forcepasswordchange', $user->id);
 
             set_moodle_cookie($USER->username);