diff --git a/.travis.yml b/.travis.yml
index 5b76678c..cc14df7e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,6 +8,7 @@ python:
   - "3.5"
   - "3.6"
   - "3.7"
+  - "3.8-dev"
   - "pypy"
   - "pypy3.5-6.0"
 install:
diff --git a/mocket/mocket.py b/mocket/mocket.py
index d90ba625..851b8bfa 100644
--- a/mocket/mocket.py
+++ b/mocket/mocket.py
@@ -71,6 +71,7 @@ def __set__(self, *args):
 
 class FakeSSLContext(SuperFakeSSLContext):
     sock = None
+    post_handshake_auth = None
 
     def __init__(self, sock=None, server_hostname=None, _context=None, *args, **kwargs):
         if isinstance(sock, MocketSocket):