diff --git a/Tests/Domain/SecurityIdentityRetrievalStrategyTest.php b/Tests/Domain/SecurityIdentityRetrievalStrategyTest.php
index deebb44..edc56f1 100644
--- a/Tests/Domain/SecurityIdentityRetrievalStrategyTest.php
+++ b/Tests/Domain/SecurityIdentityRetrievalStrategyTest.php
@@ -284,7 +284,7 @@ public function getRoles(): array
         return [];
     }
 
-    public function eraseCredentials()
+    public function eraseCredentials(): void
     {
     }
 
diff --git a/Voter/AclVoter.php b/Voter/AclVoter.php
index 14c5d56..897a189 100644
--- a/Voter/AclVoter.php
+++ b/Voter/AclVoter.php
@@ -26,8 +26,10 @@
  * This voter can be used as a base class for implementing your own permissions.
  *
  * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ *
+ * @internal
  */
-class AclVoter implements VoterInterface
+abstract class InternalAclVoter implements VoterInterface
 {
     private $aclProvider;
     private $permissionMap;
@@ -51,7 +53,10 @@ public function supportsAttribute($attribute)
         return \is_string($attribute) && $this->permissionMap->contains($attribute);
     }
 
-    public function vote(TokenInterface $token, $subject, array $attributes)
+    /**
+     * @internal
+     */
+    protected function internalVote(TokenInterface $token, $subject, array $attributes)
     {
         foreach ($attributes as $attribute) {
             if (!$this->supportsAttribute($attribute)) {
@@ -145,3 +150,21 @@ public function supportsClass($class)
         return true;
     }
 }
+
+if (class_exists(\Symfony\Component\Security\Core\Security::class)) {
+    class AclVoter extends InternalAclVoter
+    {
+        public function vote(TokenInterface $token, $subject, array $attributes)
+        {
+            return $this->internalVote($token, $subject, $attributes);
+        }
+    }
+} else {
+    class AclVoter extends InternalAclVoter
+    {
+        public function vote(TokenInterface $token, mixed $subject, array $attributes): int
+        {
+            return $this->internalVote($token, $subject, $attributes);
+        }
+    }
+}