diff --git a/modules/base/header.lua b/modules/base/header.lua
index 35525f1..fd372e3 100644
--- a/modules/base/header.lua
+++ b/modules/base/header.lua
@@ -140,6 +140,7 @@ do -- so local works
  end
  function os.getuid(pid)
   pid = pid or cT
+  if not tT[pid] then return "superuser" end
   return tT[pid].u
  end
  function os.users()