diff --git a/db/upgrade.php b/db/upgrade.php
index 9ade8467..662e3678 100755
--- a/db/upgrade.php
+++ b/db/upgrade.php
@@ -938,6 +938,9 @@ function xmldb_zoom_upgrade($oldversion) {
         $table = new xmldb_table('zoom');
         $field = new xmldb_field('registration', XMLDB_TYPE_INTEGER, '1', null, XMLDB_NOTNULL, null, '2', 'option_auto_recording');
 
+        // Set any null values to the new default: 2.
+        $DB->set_field_select('zoom', 'registration', '2', 'registration IS NULL');
+
         // Launch change of nullability for field registration.
         $dbman->change_field_notnull($table, $field);