diff --git a/lib/db/upgrade.php b/lib/db/upgrade.php
index ff56d7b0494..78a478579f5 100644
--- a/lib/db/upgrade.php
+++ b/lib/db/upgrade.php
@@ -722,9 +722,6 @@ function xmldb_main_upgrade($oldversion=0) {
     /// Launch add field idnumber
         $result = $result && add_field($table, $field);
 
-    /// Launch add index idnumber
-        $result = $result && add_index($table, $index);
-
         upgrade_main_savepoint($result, 2007041100);
     }