diff --git a/index.php b/index.php
index 171fa5f..5e04380 100644
--- a/index.php
+++ b/index.php
@@ -306,7 +306,7 @@ if (isset($_REQUEST['do'])) {
 			break;
 		case 'caslogout':
 			phpCAS::forceAuthentication();
-			phpCAS::logout();
+			phpCAS::logoutWithUrl($service_url);
 			break;
 		case 'locallogout':
 			unset($_SESSION['session_url']);