diff --git a/application/core/Auth_Controller.php b/application/core/Auth_Controller.php
index dfddc5d30..1427a318d 100644
--- a/application/core/Auth_Controller.php
+++ b/application/core/Auth_Controller.php
@@ -34,7 +34,7 @@ class Auth_Controller extends FHC_Controller
 		// Checks if this user is entitled to access to this content
 		if (!$this->permissionlib->isEntitled($requiredPermissions, $this->router->method))
 		{
-			header('HTTP/1.0 401 Unauthorized'); // set the HTTP header as unauthorized
+			$this->output->set_status_header(REST_Controller::HTTP_UNAUTHORIZED); // set the HTTP header as unauthorized
 
 			$this->load->library('EPrintfLib'); // loads the EPrintfLib to format the output
 
diff --git a/application/libraries/AuthLib.php b/application/libraries/AuthLib.php
index 43b8bd2d6..deebcb3ee 100644
--- a/application/libraries/AuthLib.php
+++ b/application/libraries/AuthLib.php
@@ -305,7 +305,7 @@ class AuthLib
 	 */
 	private function _showInvalidAuthentication()
 	{
-		header('HTTP/1.0 401 Unauthorized'); // set the HTTP header as unauthorized
+		$this->_ci->output->set_status_header(REST_Controller::HTTP_UNAUTHORIZED); // set the HTTP header as unauthorized
 		unset($_SERVER['PHP_AUTH_USER']);
 
 		$this->_ci->load->library('EPrintfLib'); // loads the EPrintfLib to format the output
@@ -325,6 +325,8 @@ class AuthLib
 	 */
 	private function _showError($errorMessage)
 	{
+		$this->_ci->output->set_status_header(REST_Controller::HTTP_UNAUTHORIZED); // set the HTTP header as unauthorized
+
 		$this->_ci->load->library('EPrintfLib'); // loads the EPrintfLib to format the output
 		$this->_ci->load->library('LogLib'); // Loads the logs library