diff --git a/Lib/ssl.py b/Lib/ssl.py
index d43d255..b56a8c8 100644
--- a/Lib/ssl.py
+++ b/Lib/ssl.py
@@ -68,7 +68,7 @@
 from _ssl import CERT_NONE, CERT_OPTIONAL, CERT_REQUIRED
 from _ssl import (
     OP_ALL, OP_NO_SSLv2, OP_NO_SSLv3, OP_NO_TLSv1,
-    OP_CIPHER_SERVER_PREFERENCE, OP_SINGLE_ECDH_USE,
+    OP_CIPHER_SERVER_PREFERENCE, OP_SINGLE_DH_USE, OP_SINGLE_ECDH_USE,
     )
 try:
     from _ssl import OP_NO_COMPRESSION