diff --git a/netlib/certutils.py b/netlib/certutils.py
index 60e414278..dab7e3189 100644
--- a/netlib/certutils.py
+++ b/netlib/certutils.py
@@ -1,4 +1,4 @@
-import os, ssl, time, datetime, tempfile, shutil
+import os, ssl, time, datetime
 from pyasn1.type import univ, constraint, char, namedtype, tag
 from pyasn1.codec.der.decoder import decode
 from pyasn1.error import PyAsn1Error