diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/Compiler/AddSecurityVotersPassTest.php b/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/Compiler/AddSecurityVotersPassTest.php
index 82205e5912..8871a3346b 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/Compiler/AddSecurityVotersPassTest.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/Compiler/AddSecurityVotersPassTest.php
@@ -88,3 +88,10 @@ class AddSecurityVotersPassTest extends TestCase
         $compilerPass->process($container);
     }
 }
+
+class VoterWithoutInterface
+{
+    public function vote()
+    {
+    }
+}
diff --git a/src/Symfony/Bundle/SecurityBundle/composer.json b/src/Symfony/Bundle/SecurityBundle/composer.json
index 8a64bcea04..a222c68ac1 100644
--- a/src/Symfony/Bundle/SecurityBundle/composer.json
+++ b/src/Symfony/Bundle/SecurityBundle/composer.json
@@ -44,7 +44,7 @@
         "twig/twig": "~1.34|~2.4"
     },
     "conflict": {
-        "symfony/security": "4.1.0-beta1",
+        "symfony/security": "4.1.0-beta1,4.1.0-beta2",
         "symfony/var-dumper": "<3.4",
         "symfony/event-dispatcher": "<3.4",
         "symfony/framework-bundle": "<4.1",