diff --git a/src/OpenSSL/SSL.py b/src/OpenSSL/SSL.py
index b571a5e..b17d25b 100644
--- a/src/OpenSSL/SSL.py
+++ b/src/OpenSSL/SSL.py
@@ -8,9 +8,9 @@
 
 from cryptography.utils import deprecated
 
-from six import binary_type as _binary_type
-from six import integer_types as integer_types
-from six import int2byte, indexbytes
+from six import (
+    binary_type as _binary_type, integer_types as integer_types, int2byte,
+    indexbytes)
 
 from OpenSSL._util import (
     UNSPECIFIED as _UNSPECIFIED,
@@ -59,9 +59,8 @@
 OP_NO_SSLv2 = _lib.SSL_OP_NO_SSLv2
 OP_NO_SSLv3 = _lib.SSL_OP_NO_SSLv3
 OP_NO_TLSv1 = _lib.SSL_OP_NO_TLSv1
-
-OP_NO_TLSv1_1 = getattr(_lib, "SSL_OP_NO_TLSv1_1", 0)
-OP_NO_TLSv1_2 = getattr(_lib, "SSL_OP_NO_TLSv1_2", 0)
+OP_NO_TLSv1_1 = _lib.SSL_OP_NO_TLSv1_1
+OP_NO_TLSv1_2 = _lib.SSL_OP_NO_TLSv1_2
 
 MODE_RELEASE_BUFFERS = _lib.SSL_MODE_RELEASE_BUFFERS