diff --git a/lib/db/mysql.php b/lib/db/mysql.php
index 9f0f535939a..8fcbbda755c 100644
--- a/lib/db/mysql.php
+++ b/lib/db/mysql.php
@@ -1673,11 +1673,6 @@ function main_upgrade($oldversion=0) {
         execute_sql("UPDATE {$CFG->prefix}user_teachers SET enrol='manual' WHERE enrol=''");
     }
 
-    if ($oldversion < 2005103101) { // rename internal to manual
-        set_config('enrol_plugins_enabled', str_replace('internal', 'manual', $CFG->enrol_plugins_enabled));
-        set_config('enrol', str_replace('internal', 'manual', $CFG->enrol));
-    }
-
     return $result;
 }
 
diff --git a/lib/db/postgres7.php b/lib/db/postgres7.php
index c3addef052b..d123db91f84 100644
--- a/lib/db/postgres7.php
+++ b/lib/db/postgres7.php
@@ -1416,11 +1416,6 @@ function main_upgrade($oldversion=0) {
         execute_sql("UPDATE {$CFG->prefix}user_teachers SET enrol='manual' WHERE enrol=''");
     }
 
-    if ($oldversion < 2005103101) { // rename internal to manual
-        set_config('enrol_plugins_enabled', str_replace('internal', 'manual', $CFG->enrol_plugins_enabled));
-        set_config('enrol', str_replace('internal', 'manual', $CFG->enrol));
-    }
-
     return $result;
 }