diff --git a/classes/db/Db.php b/classes/db/Db.php
index daa0e23dd..4a94f3b5b 100644
--- a/classes/db/Db.php
+++ b/classes/db/Db.php
@@ -211,7 +211,7 @@ abstract class DbCore
 	public static function getClass()
 	{
 		$class = 'MySQL';
-		if (extension_loaded('pdo_mysql'))
+		if (PHP_VERSION_ID >= 50200 && extension_loaded('pdo_mysql'))
 			$class = 'DbPDO';
 		else if (extension_loaded('mysqli'))
 			$class = 'DbMySQLi';