diff --git a/rwx/cmd/__init__.py b/rwx/cmd/__init__.py
index e3b75bc..ca4dced 100644
--- a/rwx/cmd/__init__.py
+++ b/rwx/cmd/__init__.py
@@ -6,6 +6,7 @@ packages: list[str] = []
 
 def need(command: str) -> None:
     """Assert package dependency for a command."""
+    package: str | None
     match command:
         case "debootstrap":
             package = "debootstrap"