diff --git a/system/database/DB_driver.php b/system/database/DB_driver.php
index 03631d6..2a8510e 100644
--- a/system/database/DB_driver.php
+++ b/system/database/DB_driver.php
@@ -372,8 +372,8 @@
 
 		if ( ! class_exists($driver))
 		{
-			include(BASEPATH.'database/DB_result'.EXT);
-			include(BASEPATH.'database/drivers/'.$this->dbdriver.'/'.$this->dbdriver.'_result'.EXT);
+			include_once(BASEPATH.'database/DB_result'.EXT);
+			include_once(BASEPATH.'database/drivers/'.$this->dbdriver.'/'.$this->dbdriver.'_result'.EXT);
 		}
 		
 		return $driver;