diff --git a/mod/lesson/lib.php b/mod/lesson/lib.php
index a6d11420a85c2..4f2be7be94432 100644
--- a/mod/lesson/lib.php
+++ b/mod/lesson/lib.php
@@ -165,7 +165,6 @@ function lesson_update_instance($lesson) {
     if ($lesson->lessondefault) {
         $default = new stdClass;
         $default = clone($lesson);
-        $default = $lesson;
         unset($default->lessondefault);
         unset($default->name);
         unset($default->timemodified);