diff --git a/src/OpenSSL/SSL.py b/src/OpenSSL/SSL.py
index eeb92f6..5521151 100644
--- a/src/OpenSSL/SSL.py
+++ b/src/OpenSSL/SSL.py
@@ -46,6 +46,7 @@
     'OP_NO_TLSv1',
     'OP_NO_TLSv1_1',
     'OP_NO_TLSv1_2',
+    'OP_NO_TLSv1_3',
     'MODE_RELEASE_BUFFERS',
     'OP_SINGLE_DH_USE',
     'OP_SINGLE_ECDH_USE',
@@ -139,6 +140,10 @@
 OP_NO_TLSv1 = _lib.SSL_OP_NO_TLSv1
 OP_NO_TLSv1_1 = _lib.SSL_OP_NO_TLSv1_1
 OP_NO_TLSv1_2 = _lib.SSL_OP_NO_TLSv1_2
+try:
+    OP_NO_TLSv1_3 = _lib.SSL_OP_NO_TLSv1_3
+except AttributeError:
+    pass
 
 MODE_RELEASE_BUFFERS = _lib.SSL_MODE_RELEASE_BUFFERS