diff --git a/tools/python/xen/xend/XendDomain.py b/tools/python/xen/xend/XendDomain.py
index 5f36113e30..83cb512160 100644
--- a/tools/python/xen/xend/XendDomain.py
+++ b/tools/python/xen/xend/XendDomain.py
@@ -428,7 +428,7 @@ class XendDomain:
             raise XendInvalidDomain(str(domid))
 
         if dominfo.getDomid() == PRIV_DOMAIN:
-            raise XendError("Cannot migrate privileged domain %i" % domid)
+            raise XendError("Cannot migrate privileged domain %s" % domid)
 
         """ The following call may raise a XendError exception """
         dominfo.testMigrateDevices(True, dst)
@@ -458,7 +458,7 @@ class XendDomain:
                 raise XendInvalidDomain(str(domid))
 
             if dominfo.getDomid() == PRIV_DOMAIN:
-                raise XendError("Cannot save privileged domain %i" % domid)
+                raise XendError("Cannot save privileged domain %s" % domid)
 
             fd = os.open(dst, os.O_WRONLY | os.O_CREAT | os.O_TRUNC)
             try: