diff --git a/library/Icinga/Data/Db/DbConnection.php b/library/Icinga/Data/Db/DbConnection.php
index 0c5b44597..15a249f60 100644
--- a/library/Icinga/Data/Db/DbConnection.php
+++ b/library/Icinga/Data/Db/DbConnection.php
@@ -139,14 +139,7 @@ class DbConnection implements Selectable, Extensible, Updatable, Reducible, Insp
         switch ($this->dbType) {
             case 'mssql':
                 $adapter = 'Pdo_Mssql';
-                $pdoType = $this->config->get('pdoType', 'dblib');
-                if ($pdoType === 'dblib') {
-                    // Driver does not support setting attributes
-                    unset($adapterParamaters['persistent']);
-                    unset($adapterParamaters['options']);
-                    unset($adapterParamaters['driver_options']);
-                }
-                $adapterParamaters['pdoType'] = $pdoType;
+                $adapterParamaters['pdoType'] = $this->config->get('pdoType', 'dblib');
                 $defaultPort = 1433;
                 break;
             case 'mysql':