diff --git a/lib/dmllib.php b/lib/dmllib.php
index 9ac2deb90a9..b36c46b3eb8 100644
--- a/lib/dmllib.php
+++ b/lib/dmllib.php
@@ -231,6 +231,14 @@ function setup_DB() {
                 $CFG->dblibrary = 'native';
                 break;
 
+            case 'mssql_n':
+                $CFG->dbtype = 'mssql';
+                // continue, no break here
+
+            case 'mssql':
+                $CFG->dblibrary = 'native';
+                break;
+
             case 'mysql' :
                 if (!extension_loaded('mysqli')) {
                     $CFG->dblibrary = 'adodb';