diff --git a/paramiko/channel.py b/paramiko/channel.py
index 35991de..9a1bb87 100644
--- a/paramiko/channel.py
+++ b/paramiko/channel.py
@@ -25,6 +25,7 @@ import sys
 import time
 import threading
 import socket
+import errno
 import os
 
 from paramiko.common import *