diff --git a/tests/test_websocket.py b/tests/test_websocket.py
index d8acb4f..545fa1c 100644
--- a/tests/test_websocket.py
+++ b/tests/test_websocket.py
@@ -324,8 +324,9 @@ class WebSocketServerTestCase(unittest.TestCase):
                              tcp_keepidle=keepidle,
                              tcp_keepintvl=keepintvl)
 
-        self.assertEqual(sock.getsockopt(socket.SOL_TCP,
-                                         socket.TCP_KEEPCNT), keepcnt)
+        if hasattr(socket, 'TCP_KEEPCNT'):
+            self.assertEqual(sock.getsockopt(socket.SOL_TCP,
+                                             socket.TCP_KEEPCNT), keepcnt)
         self.assertEqual(sock.getsockopt(socket.SOL_TCP,
                                          socket.TCP_KEEPIDLE), keepidle)
         self.assertEqual(sock.getsockopt(socket.SOL_TCP,
@@ -337,8 +338,9 @@ class WebSocketServerTestCase(unittest.TestCase):
                              tcp_keepidle=keepidle,
                              tcp_keepintvl=keepintvl)
 
-        self.assertNotEqual(sock.getsockopt(socket.SOL_TCP,
-                                            socket.TCP_KEEPCNT), keepcnt)
+        if hasattr(socket, 'TCP_KEEPCNT'):
+            self.assertNotEqual(sock.getsockopt(socket.SOL_TCP,
+                                                socket.TCP_KEEPCNT), keepcnt)
         self.assertNotEqual(sock.getsockopt(socket.SOL_TCP,
                                             socket.TCP_KEEPIDLE), keepidle)
         self.assertNotEqual(sock.getsockopt(socket.SOL_TCP,
diff --git a/websockify/websocket.py b/websockify/websocket.py
index 16e1dc4..b146eeb 100644
--- a/websockify/websocket.py
+++ b/websockify/websocket.py
@@ -723,8 +723,11 @@ class WebSocketServer(object):
             if  tcp_keepalive:
                 sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
                 if tcp_keepcnt:
-                    sock.setsockopt(socket.SOL_TCP, socket.TCP_KEEPCNT,
-                                    tcp_keepcnt)
+                    if hasattr(socket, 'TCP_KEEPCNT'):
+                        sock.setsockopt(socket.SOL_TCP, socket.TCP_KEEPCNT,
+                                        tcp_keepcnt)
+                    else:
+                        self.msg('tcp_keepcnt not available on your system')
                 if tcp_keepidle:
                     sock.setsockopt(socket.SOL_TCP, socket.TCP_KEEPIDLE,
                                     tcp_keepidle)