diff --git a/server-ca/chocolate.py b/server-ca/chocolate.py
index c57265e7b..ca8120989 100755
--- a/server-ca/chocolate.py
+++ b/server-ca/chocolate.py
@@ -4,7 +4,7 @@ import web, redis, time
 import CSR
 import hashlib
 import hmac
-from Crypto.PublicKey import RSA
+import M2Crypto
 from Crypto import Random
 from chocolate_protocol_pb2 import chocolatemessage
 from google.protobuf.message import DecodeError