diff --git a/classes/db/DBMysql_innodb.class.php b/classes/db/DBMysql_innodb.class.php
index c5cda9b15..67c59722a 100644
--- a/classes/db/DBMysql_innodb.class.php
+++ b/classes/db/DBMysql_innodb.class.php
@@ -1,5 +1,5 @@
 <?php
-	require('DBMysql.class.php');
+	require_once('DBMysql.class.php');
 
     /**
      * @class DBMysql_innodb
diff --git a/classes/db/DBMysqli.class.php b/classes/db/DBMysqli.class.php
index b1883a6e2..07f569046 100644
--- a/classes/db/DBMysqli.class.php
+++ b/classes/db/DBMysqli.class.php
@@ -1,5 +1,5 @@
 <?php
-	require('DBMysql.class.php');
+	require_once('DBMysql.class.php');
     /**
      * @class DBMysqli
      * @author NHN (developers@xpressengine.com)