diff --git a/enrol/self/db/upgrade.php b/enrol/self/db/upgrade.php
index 6fee53d6101..a4e0e5bac6a 100644
--- a/enrol/self/db/upgrade.php
+++ b/enrol/self/db/upgrade.php
@@ -51,6 +51,11 @@ function xmldb_enrol_self_upgrade($oldversion) {
 
     // Moodle v2.5.0 release upgrade line.
     // Put any upgrade step following this.
+    if ($oldversion < 2013112100) {
+        // Set customint1 (group enrolment key) to 0 if it was not set (null).
+        $DB->execute("UPDATE {enrol} SET customint1 = 0 WHERE enrol = 'self' AND customint1 IS NULL");
+        upgrade_plugin_savepoint(true, 2013112100, 'enrol', 'self');
+    }
 
 
     return true;
diff --git a/enrol/self/version.php b/enrol/self/version.php
index 851e8b6a70d..096485017f6 100644
--- a/enrol/self/version.php
+++ b/enrol/self/version.php
@@ -24,7 +24,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version   = 2013050100;        // The current plugin version (Date: YYYYMMDDXX)
+$plugin->version   = 2013112100;        // The current plugin version (Date: YYYYMMDDXX)
 $plugin->requires  = 2013050100;        // Requires this Moodle version
 $plugin->component = 'enrol_self';      // Full name of the plugin (used for diagnostics)
 $plugin->cron      = 600;