diff --git a/src/calibre/parallel.py b/src/calibre/parallel.py
index d33728042b..f794626441 100644
--- a/src/calibre/parallel.py
+++ b/src/calibre/parallel.py
@@ -25,7 +25,7 @@
 is buffered and asynchronous to prevent the job from being IO bound.  
 '''
 import sys, os, gc, cPickle, traceback, atexit, cStringIO, time, signal, \
-       subprocess, socket, collections, binascii, re, tempfile, thread, tempfile
+       subprocess, socket, collections, binascii, re, thread, tempfile
 from select import select
 from functools import partial
 from threading import RLock, Thread, Event
@@ -494,6 +494,11 @@ def __item__(self, i):
     def __iter__(self):
         return iter((self.result, self.exception, self.traceback))
 
+def remove_ipc_socket(path):
+    os = __import__('os')
+    if os.path.exists(path):
+        os.path.unlink(path)
+
 class Server(Thread):
     
     KILL_RESULT = Overseer.KILL_RESULT
@@ -508,13 +513,13 @@ def __init__(self, number_of_workers=detect_ncpus()):
         self.port = tempfile.mktemp(prefix='calibre_server')+'_%d_'%self.PID if not iswindows else self.START_PORT
         while True:
             try:
-            	address = ('localhost', self.port) if iswindows else self.port
-            	self.server_socket.bind(address)
+                address = ('localhost', self.port) if iswindows else self.port
+                self.server_socket.bind(address)
                 break
             except socket.error:
                 self.port += (1 if iswindows else '1')
         if not iswindows:
-            atexit.register(os.unlink, self.port)
+            atexit.register(remove_ipc_socket, self.port)
         self.server_socket.listen(5)
         self.number_of_workers = number_of_workers 
         self.pool, self.jobs, self.working, self.results = [], collections.deque(), [], {}