diff --git a/src/Symfony/Component/Routing/Loader/AttributeClassLoader.php b/src/Symfony/Component/Routing/Loader/AttributeClassLoader.php
index 254582bf35584..69ccaf7f26ea1 100644
--- a/src/Symfony/Component/Routing/Loader/AttributeClassLoader.php
+++ b/src/Symfony/Component/Routing/Loader/AttributeClassLoader.php
@@ -242,17 +242,21 @@ protected function addRoute(RouteCollection $collection, object $attr, array $gl
                 $collection->add($name, $route, $priority);
             }
             foreach ($attr->getAliases() as $aliasAttribute) {
+                $original = $name;
+                if (0 !== $locale) {
+                    $original .= '.'.$locale;
+                }
+
                 if ($aliasAttribute instanceof DeprecatedAlias) {
-                    $alias = $collection->addAlias($aliasAttribute->getAliasName(), $name);
+                    $alias = $collection->addAlias($aliasAttribute->getAliasName(), $original);
                     $alias->setDeprecated(
                         $aliasAttribute->getPackage(),
                         $aliasAttribute->getVersion(),
                         $aliasAttribute->getMessage()
                     );
-                    continue;
+                } else {
+                    $collection->addAlias($aliasAttribute, $original);
                 }
-
-                $collection->addAlias($aliasAttribute, $name);
             }
         }
     }
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/AttributeFixtures/AliasLocalizedRouteController.php b/src/Symfony/Component/Routing/Tests/Fixtures/AttributeFixtures/AliasLocalizedRouteController.php
new file mode 100644
index 0000000000000..6fbd4eb127218
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/AttributeFixtures/AliasLocalizedRouteController.php
@@ -0,0 +1,22 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Routing\Tests\Fixtures\AttributeFixtures;
+
+use Symfony\Component\Routing\Attribute\Route;
+
+class AliasLocalizedRouteController
+{
+    #[Route(['nl_NL' => '/nl/localized', 'fr_FR' => '/fr/localized'], name: 'localized_route', alias: ['localized_alias'])]
+    public function localized()
+    {
+    }
+}
diff --git a/src/Symfony/Component/Routing/Tests/Loader/AttributeClassLoaderTest.php b/src/Symfony/Component/Routing/Tests/Loader/AttributeClassLoaderTest.php
index 50a10a16cac2f..f6e8f30ceac13 100644
--- a/src/Symfony/Component/Routing/Tests/Loader/AttributeClassLoaderTest.php
+++ b/src/Symfony/Component/Routing/Tests/Loader/AttributeClassLoaderTest.php
@@ -18,6 +18,7 @@
 use Symfony\Component\Routing\Tests\Fixtures\AttributeFixtures\ActionPathController;
 use Symfony\Component\Routing\Tests\Fixtures\AttributeFixtures\AliasClassController;
 use Symfony\Component\Routing\Tests\Fixtures\AttributeFixtures\AliasInvokableController;
+use Symfony\Component\Routing\Tests\Fixtures\AttributeFixtures\AliasLocalizedRouteController;
 use Symfony\Component\Routing\Tests\Fixtures\AttributeFixtures\AliasRouteController;
 use Symfony\Component\Routing\Tests\Fixtures\AttributeFixtures\BazClass;
 use Symfony\Component\Routing\Tests\Fixtures\AttributeFixtures\DefaultValueController;
@@ -381,6 +382,19 @@ public function testAliasesOnMethod()
         $this->assertEquals(new Alias('action_with_alias'), $routes->getAlias('completely_different_name'));
     }
 
+    public function testLocalizedRouteWithAliases()
+    {
+        $routes = $this->loader->load(AliasLocalizedRouteController::class);
+        $this->assertCount(2, $routes);
+
+        $routeNl = $routes->get('localized_route.nl_NL');
+        $routeFr = $routes->get('localized_route.fr_FR');
+
+        $this->assertSame('/nl/localized', $routeNl->getPath());
+        $this->assertSame('/fr/localized', $routeFr->getPath());
+        $this->assertEquals(new Alias('localized_route.nl_NL'), $routes->getAlias('localized_alias'));
+    }
+
     public function testThrowsWithAliasesOnClass()
     {
         $this->expectException(\InvalidArgumentException::class);