diff --git a/ssh/agent.py b/ssh/agent.py
index e613531..8cad6e9 100644
--- a/ssh/agent.py
+++ b/ssh/agent.py
@@ -25,6 +25,7 @@ import socket
 import struct
 import sys
 import threading
+import time
 import tempfile
 import stat
 import fcntl