diff --git a/test_websocket.py b/test_websocket.py
index 191d282..3c68287 100644
--- a/test_websocket.py
+++ b/test_websocket.py
@@ -1,7 +1,10 @@
 # -*- coding: utf-8 -*-
 #
 
-import unittest
+# stdlib
+import base64, unittest, uuid
+
+# websocket-client
 import websocket as ws
 
 TRACABLE=False
@@ -213,6 +216,12 @@ class WebSocketTest(unittest.TestCase):
         self.assertRaises(error, s.send, "Hello")
         self.assertRaises(error, s.recv)
         
+    def testUUID4(self):
+        """ WebSocket key should be a UUID4.
+        """
+        key = ws._create_sec_websocket_key()
+        u = uuid.UUID(bytes=base64.b64decode(key))
+        self.assertEquals(4, u.version)
         
 
 if __name__ == "__main__":
diff --git a/websocket.py b/websocket.py
index b9353d9..bcceedc 100644
--- a/websocket.py
+++ b/websocket.py
@@ -166,7 +166,7 @@ _MAX_CHAR_BYTE = (1<<8) -1
 # http://axod.blogspot.com/2010/06/websocket-gets-update-and-it-breaks.html
 
 def _create_sec_websocket_key():
-    uid = uuid.uuid1()
+    uid = uuid.uuid4()
     return base64.encodestring(uid.bytes).strip()
 
 _HEADERS_TO_CHECK = {