diff --git a/tools/python/xen/xm/main.py b/tools/python/xen/xm/main.py
index e195196a5e..d711ef9d69 100644
--- a/tools/python/xen/xm/main.py
+++ b/tools/python/xen/xm/main.py
@@ -434,7 +434,7 @@ def xm_sedf(args):
     arg_check(args, 6, "sedf")
     
     dom = args[0]
-    v = map(int, args[1:5])
+    v = map(int, args[1:6])
     from xen.xend.XendClient import server
     server.xend_domain_cpu_sedf_set(dom, *v)