diff --git a/system/core/Loader.php b/system/core/Loader.php
index 80de804..62781a7 100644
--- a/system/core/Loader.php
+++ b/system/core/Loader.php
@@ -321,7 +321,7 @@
 		}
 
 		$model = ucfirst($model);
-		if ( ! class_exists($model))
+		if ( ! class_exists($model, FALSE))
 		{
 			foreach ($this->_ci_model_paths as $mod_path)
 			{
diff --git a/system/libraries/Session/Session.php b/system/libraries/Session/Session.php
index b93c00c..77c56ae 100644
--- a/system/libraries/Session/Session.php
+++ b/system/libraries/Session/Session.php
@@ -231,7 +231,7 @@
 			}
 		}
 
-		if ( ! class_exists($prefix.$class) && file_exists($file_path = APPPATH.'libraries/Session/drivers/'.$prefix.$class.'.php'))
+		if ( ! class_exists($prefix.$class, FALSE) && file_exists($file_path = APPPATH.'libraries/Session/drivers/'.$prefix.$class.'.php'))
 		{
 			require_once($file_path);
 			if (class_exists($prefix.$class, FALSE))