diff --git a/tools/python/xen/xend/XendBootloader.py b/tools/python/xen/xend/XendBootloader.py
index e1e229ddc8..879b39806d 100644
--- a/tools/python/xen/xend/XendBootloader.py
+++ b/tools/python/xen/xend/XendBootloader.py
@@ -38,7 +38,7 @@ def bootloader(blexec, disk, quiet = 0, blargs = None, imgcfg = None):
         raise VmError(msg)
 
     while True:
-        fifo = "/var/lib/xen/xenbl.%s" %(random.randint(0, 32000),)
+        fifo = "/var/lib/xen/xenbl.%s" % random.randint(0, 32000)
         if not os.path.exists(fifo):
             break
     os.mkfifo(fifo, 0600)
@@ -48,7 +48,7 @@ def bootloader(blexec, disk, quiet = 0, blargs = None, imgcfg = None):
         args = [ blexec ]
         if quiet:
             args.append("-q")
-        args.append("--output=%s" %(fifo,))
+        args.append("--output=%s" % fifo)
         if blargs is not None:
             args.extend(shlex.split(blargs))
         args.append(disk)