diff --git a/tools/python/xen/xm/main.py b/tools/python/xen/xm/main.py
index bc27b6f9cd..d19a131972 100644
--- a/tools/python/xen/xm/main.py
+++ b/tools/python/xen/xm/main.py
@@ -140,7 +140,7 @@ SUBCOMMAND_HELP = {
                      'Send a trigger to a domain.'),
     'vcpu-list'   : ('[<Domain>]',
                      'List the VCPUs for a domain or all domains.'),
-    'vcpu-pin'    : ('<Domain> <VCPU> <CPUs|all>',
+    'vcpu-pin'    : ('<Domain> <VCPU|all> <CPUs|all>',
                      'Set which CPUs a VCPU can use.'),
     'vcpu-set'    : ('<Domain> <vCPUs>',
                      'Set the number of active VCPUs for allowed for the'
@@ -1330,7 +1330,7 @@ def xm_vcpu_pin(args):
         return cpus
 
     dom  = args[0]
-    vcpu = int(args[1])
+    vcpu = args[1]
     if args[2] == 'all':
         cpumap = cpu_make_map('0-63')
     else: