diff --git a/src/OpenSSL/SSL.py b/src/OpenSSL/SSL.py
index 967c73322..901d649e5 100644
--- a/src/OpenSSL/SSL.py
+++ b/src/OpenSSL/SSL.py
@@ -156,7 +156,10 @@ class _buffer(object):
 TLS1_VERSION = _lib.TLS1_VERSION
 TLS1_1_VERSION = _lib.TLS1_1_VERSION
 TLS1_2_VERSION = _lib.TLS1_2_VERSION
-TLS1_3_VERSION = _lib.TLS1_3_VERSION
+try:
+    TLS1_3_VERSION = _lib.TLS1_3_VERSION
+except AttributeError:
+    pass
 
 OP_NO_SSLv2 = _lib.SSL_OP_NO_SSLv2
 OP_NO_SSLv3 = _lib.SSL_OP_NO_SSLv3