diff --git a/src/Symfony/Component/Console/Command/Command.php b/src/Symfony/Component/Console/Command/Command.php
index e5d4cf18a1f0e..d07d8b137430b 100644
--- a/src/Symfony/Component/Console/Command/Command.php
+++ b/src/Symfony/Component/Console/Command/Command.php
@@ -31,6 +31,7 @@ class Command
 {
     public const SUCCESS = 0;
     public const FAILURE = 1;
+    public const INVALID = 2;
 
     /**
      * @var string|null The default command name