diff --git a/dkim/__init__.py b/dkim/__init__.py
index c24144e..7f2fc57 100644
--- a/dkim/__init__.py
+++ b/dkim/__init__.py
@@ -6,7 +6,6 @@ import time
 import dns.resolver
 
 from dkim.crypto import (
-    EMSA_PKCS1_v1_5_encode,
     parse_private_key,
     parse_public_key,
     RSASSA_PKCS1_v1_5_sign,
diff --git a/dkim/crypto.py b/dkim/crypto.py
index a43bef0..c2bba28 100644
--- a/dkim/crypto.py
+++ b/dkim/crypto.py
@@ -18,7 +18,6 @@
 # Copyright (c) 2011 William Grant <me@williamgrant.id.au>
 
 __all__ = [
-    'EMSA_PKCS1_v1_5_encode',
     'parse_private_key',
     'parse_public_key',
     'RSASSA_PKCS1_v1_5_sign',