diff --git a/src/Authentication/Provider/SimpleOauthAuthenticationProvider.php b/src/Authentication/Provider/SimpleOauthAuthenticationProvider.php
index c87e928..7953316 100644
--- a/src/Authentication/Provider/SimpleOauthAuthenticationProvider.php
+++ b/src/Authentication/Provider/SimpleOauthAuthenticationProvider.php
@@ -7,6 +7,7 @@ use Drupal\simple_oauth\Authentication\TokenAuthUser;
 use Drupal\simple_oauth\Server\ResourceServerInterface;
 use League\OAuth2\Server\Exception\OAuthServerException;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Exception\HttpException;
 
 /**
  * @internal
@@ -66,6 +67,8 @@ class SimpleOauthAuthenticationProvider implements SimpleOauthAuthenticationProv
       // Procedural code here is hard to avoid.
       watchdog_exception('simple_oauth', $exception);
 
+      throw new HttpException($exception->getHttpStatusCode(), $exception->getHint(), null, $exception->getHttpHeaders());
+
       return NULL;
     }