diff --git a/Lib/test/test_socket.py b/Lib/test/test_socket.py
index faa4868..e2a6c35 100644
--- a/Lib/test/test_socket.py
+++ b/Lib/test/test_socket.py
@@ -5593,6 +5593,9 @@ class TestMSWindowsTCPFlags(unittest.TestCase):
                        'TCP_FASTOPEN',
                        # available starting with Windows 10 1703
                        'TCP_KEEPCNT',
+					   # available starting with Windows 10 1709
+					   'TCP_KEEPIDLE',
+					   'TCP_KEEPINVL',
                        }
 
     def test_new_tcp_flags(self):
