diff --git a/src/Command/BackgroundCommand.php b/src/Command/BackgroundCommand.php
index 3e98581..1823e8f 100644
--- a/src/Command/BackgroundCommand.php
+++ b/src/Command/BackgroundCommand.php
@@ -24,11 +24,11 @@ class BackgroundCommand extends Command
      */
     private $backgroundExecute;
 
-    public function __construct(string $name = null)
+    public function __construct(?string $name = null)
     {
         parent::__construct($name);
+        parent::setCode(\Closure::fromCallable([$this, 'background']));
 
-        parent::setCode([$this, 'background']);
         $this->backgroundExecute = [$this, 'execute'];
 
         // add stop signals
diff --git a/src/Command/DaemonCommand.php b/src/Command/DaemonCommand.php
index d99ca5f..ecca4c6 100644
--- a/src/Command/DaemonCommand.php
+++ b/src/Command/DaemonCommand.php
@@ -16,7 +16,7 @@
  */
 class DaemonCommand extends BackgroundCommand
 {
-    public function __construct(string $name = null)
+    public function __construct(?string $name = null)
     {
         parent::__construct($name);
         $this->configureDaemon();