diff --git a/src/saml2/sigver.py b/src/saml2/sigver.py
index 1a82599..8e57a8d 100644
--- a/src/saml2/sigver.py
+++ b/src/saml2/sigver.py
@@ -8,7 +8,6 @@ Based on the use of xmlsec1 binaries and not the python xmlsec module.
 from OpenSSL import crypto
 
 import base64
-from base64 import b64decode
 import hashlib
 import logging
 import os