diff --git a/src/Symfony/Component/Security/Core/Authorization/DebugAccessDecisionManager.php b/src/Symfony/Component/Security/Core/Authorization/DebugAccessDecisionManager.php
index 59a47969e329..aaf04a4fb00c 100644
--- a/src/Symfony/Component/Security/Core/Authorization/DebugAccessDecisionManager.php
+++ b/src/Symfony/Component/Security/Core/Authorization/DebugAccessDecisionManager.php
@@ -11,12 +11,26 @@
 
 namespace Symfony\Component\Security\Core\Authorization;
 
-/*
- * @internal
- *
- * @deprecated The DebugAccessDecisionManager class has been renamed and is deprecated since version 3.3 and will be removed in 4.0. Use the TraceableAccessDecisionManager class instead.
- *
- * This is a placeholder for the old class, that got renamed; this is not a BC break since the class is internal, this
- * placeholder is here just to help backward compatibility with older SecurityBundle versions.
- */
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+
 class_exists(TraceableAccessDecisionManager::class);
+
+if (false) {
+    /**
+     * This is a placeholder for the old class, that got renamed; this is not a BC break since the class is internal, this
+     * placeholder is here just to help backward compatibility with older SecurityBundle versions.
+     *
+     * @deprecated The DebugAccessDecisionManager class has been renamed and is deprecated since version 3.3 and will be removed in 4.0. Use the TraceableAccessDecisionManager class instead.
+     *
+     * @internal
+     */
+    class DebugAccessDecisionManager implements AccessDecisionManagerInterface
+    {
+        /**
+         * {@inheritdoc}
+         */
+        public function decide(TokenInterface $token, array $attributes, $object = null)
+        {
+        }
+    }
+}
diff --git a/src/Symfony/Component/Security/Core/Authorization/TraceableAccessDecisionManager.php b/src/Symfony/Component/Security/Core/Authorization/TraceableAccessDecisionManager.php
index f07f117eec30..1e3ed546c8ae 100644
--- a/src/Symfony/Component/Security/Core/Authorization/TraceableAccessDecisionManager.php
+++ b/src/Symfony/Component/Security/Core/Authorization/TraceableAccessDecisionManager.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\Security\Core\Authorization;
 
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+use Symfony\Component\Security\Core\Authorization\Voter\VoterInterface;
 
 /**
  * Decorates the original AccessDecisionManager class to log information