diff --git a/sshuttle/ssh.py b/sshuttle/ssh.py
index 5ecdec8..c93aa8c 100644
--- a/sshuttle/ssh.py
+++ b/sshuttle/ssh.py
@@ -4,6 +4,7 @@ import re
 import socket
 import zlib
 import importlib
+import importlib.util
 import subprocess as ssubprocess
 import shlex
 from shlex import quote