diff --git a/lib/IndexController.php b/lib/IndexController.php
index 2962a6d..e57372c 100644
--- a/lib/IndexController.php
+++ b/lib/IndexController.php
@@ -111,6 +111,9 @@ class IndexController extends Controller {
 			$form_values['message'] ?? '[no message provided]',
 		]);
 
+		// Destroy the session
+		$session->destroy();
+
 		// And return a success message
 		$html = $this->container->get('html');
 		$response->getBody()->write($html->renderDocument(