diff --git a/src/Adapter/AdapterDefinitionFactory.php b/src/Adapter/AdapterDefinitionFactory.php
index f5c8d4f..809c263 100644
--- a/src/Adapter/AdapterDefinitionFactory.php
+++ b/src/Adapter/AdapterDefinitionFactory.php
@@ -40,7 +40,7 @@ public function __construct()
         ];
     }
 
-    public function createDefinition(string $name, array $options, ?string $defaultVisibilityForDirectories): ?Definition
+    public function createDefinition(string $name, array $options, ?string $defaultVisibilityForDirectories = null): ?Definition
     {
         foreach ($this->builders as $builder) {
             if ($builder->getName() === $name) {
diff --git a/tests/Adapter/AdapterDefinitionFactoryTest.php b/tests/Adapter/AdapterDefinitionFactoryTest.php
index 44cd4a7..dc7d531 100644
--- a/tests/Adapter/AdapterDefinitionFactoryTest.php
+++ b/tests/Adapter/AdapterDefinitionFactoryTest.php
@@ -34,7 +34,7 @@ public function testCreateDefinition($name, $options)
     {
         $factory = new AdapterDefinitionFactory();
 
-        $definition = $factory->createDefinition($name, $options, null);
+        $definition = $factory->createDefinition($name, $options);
         $this->assertInstanceOf(Definition::class, $definition);
     }
 }