diff --git a/tools/python/xen/xm/main.py b/tools/python/xen/xm/main.py
index 09bf7266c9..5ba20095e5 100644
--- a/tools/python/xen/xm/main.py
+++ b/tools/python/xen/xm/main.py
@@ -302,7 +302,7 @@ class ProgMigrate(Prog):
     info = """Migrate a domain to another machine."""
 
     def help(self, args):
-        migrate.help(arg)
+        migrate.help(args)
     
     def main(self, args):
         migrate.main(args)