diff --git a/EventListener/GuardListener.php b/EventListener/GuardListener.php
index c8f00d9..03c779d 100644
--- a/EventListener/GuardListener.php
+++ b/EventListener/GuardListener.php
@@ -75,7 +75,7 @@ private function getVariables(GuardEvent $event)
         $token = $this->tokenStorage->getToken();
 
         if (null === $token) {
-            throw new InvalidTokenConfigurationException(sprintf('There are no tokens available for workflow %s.', $event->getWorkflowName()));
+            throw new InvalidTokenConfigurationException(sprintf('There are no tokens available for workflow "%s".', $event->getWorkflowName()));
         }
 
         if (null !== $this->roleHierarchy) {