diff --git a/library/Icinga/Test/BaseTestCase.php b/library/Icinga/Test/BaseTestCase.php
index 50f7bc1b9..b72bdee62 100644
--- a/library/Icinga/Test/BaseTestCase.php
+++ b/library/Icinga/Test/BaseTestCase.php
@@ -317,6 +317,7 @@ namespace Icinga\Test {
             $form = new $formClass;
             // If the form has CSRF protection enabled, add the token to the request data, else all calls to
             // isSubmittedAndValid will fail
+            $form->setSessionId('1234');
             $form->initCsrfToken();
             $token = $form->getValue($form->getTokenElementName());
             if ($token !== null) {