diff --git a/tools/python/xen/xm/main.py b/tools/python/xen/xm/main.py
index 6bf7f83d83..654dc553e2 100644
--- a/tools/python/xen/xm/main.py
+++ b/tools/python/xen/xm/main.py
@@ -305,7 +305,7 @@ class ProgMigrate(Prog):
         migrate.help([self.name] + args)
     
     def main(self, args):
-        migrate.main([self.name] + args)
+        migrate.main(args)
 
 xm.prog(ProgMigrate)
 
diff --git a/tools/python/xen/xm/migrate.py b/tools/python/xen/xm/migrate.py
index 3b446f0bf0..dd81aab0df 100644
--- a/tools/python/xen/xm/migrate.py
+++ b/tools/python/xen/xm/migrate.py
@@ -33,7 +33,7 @@ def main(argv):
         opts.usage()
         return
     if len(args) != 2:
-        opts.err('Invalid arguments')
+        opts.err('Invalid arguments: ' + str(args))
     dom = args[0]
     dst = args[1]
     if dom in [DOM0_NAME, DOM0_ID]: