diff --git a/dibi/drivers/DibiPdoDriver.php b/dibi/drivers/DibiPdoDriver.php
index de73954d..192bb70a 100644
--- a/dibi/drivers/DibiPdoDriver.php
+++ b/dibi/drivers/DibiPdoDriver.php
@@ -66,7 +66,7 @@ class DibiPdoDriver extends DibiObject implements IDibiDriver, IDibiResultDriver
 
 		if ($config['resource'] instanceof PDO) {
 			$this->connection = $config['resource'];
-
+			unset($config['resource'], $config['pdo']);
 		} else {
 			try {
 				$this->connection = new PDO($config['dsn'], $config['username'], $config['password'], $config['options']);