diff --git a/src/Bridge/Symfony/CocurSlugifyExtension.php b/src/Bridge/Symfony/CocurSlugifyExtension.php
index b891d023..bbfc5a82 100644
--- a/src/Bridge/Symfony/CocurSlugifyExtension.php
+++ b/src/Bridge/Symfony/CocurSlugifyExtension.php
@@ -61,7 +61,7 @@ public function load(array $configs, ContainerBuilder $container)
 
         // for symfony versions >= 3.3
         if (Kernel::VERSION_ID >= 30300) {
-            $container->setAlias('Cocur\Slugify\SlugifyInterface', 'cocur_slugify');
+            $container->setAlias('Cocur\Slugify\SlugifyInterface', 'cocur_slugify')->setPublic(true);
         }
     }
 }