diff --git a/system/core/Loader.php b/system/core/Loader.php
index 0a5cf5b..49bd641 100644
--- a/system/core/Loader.php
+++ b/system/core/Loader.php
@@ -658,7 +658,7 @@
 			return FALSE;
 		}
 
-		if ( ! class_exists('CI_Driver_Library'))
+		if ( ! class_exists('CI_Driver_Library', FALSE))
 		{
 			// We aren't instantiating an object here, just making the base class available
 			require BASEPATH.'libraries/Driver.php';
diff --git a/system/database/DB_driver.php b/system/database/DB_driver.php
index 9239dc1..593d78b 100644
--- a/system/database/DB_driver.php
+++ b/system/database/DB_driver.php
@@ -704,7 +704,7 @@
 	{
 		$driver = 'CI_DB_'.$this->dbdriver.'_result';
 
-		if ( ! class_exists($driver))
+		if ( ! class_exists($driver, FALSE))
 		{
 			include_once(BASEPATH.'database/DB_result.php');
 			include_once(BASEPATH.'database/drivers/'.$this->dbdriver.'/'.$this->dbdriver.'_result.php');