diff --git a/eventlet/green/zmq.py b/eventlet/green/zmq.py
index 05ad376..09caf28 100644
--- a/eventlet/green/zmq.py
+++ b/eventlet/green/zmq.py
@@ -13,6 +13,15 @@ slurp_properties(__zmq__, globals(), ignore=__patched__)
 
 from collections import deque
 
+try:
+    # alias XREQ/XREP to DEALER/ROUTER if available
+    if not hasattr(__zmq__, 'XREQ'):
+        XREQ = DEALER
+    if not hasattr(__zmq__, 'XREP'):
+        XREP = ROUTER
+except NameError:
+    pass
+
 
 class LockReleaseError(Exception):
     pass
@@ -196,10 +205,10 @@ class Socket(_Socket):
     def __init__(self, context, socket_type):
         super(Socket, self).__init__(context, socket_type)
 
-        self._eventlet_send_event = _BlockedThread()
-        self._eventlet_recv_event = _BlockedThread()
-        self._eventlet_send_lock = _QueueLock()
-        self._eventlet_recv_lock = _QueueLock()
+        self.__dict__['_eventlet_send_event'] = _BlockedThread()
+        self.__dict__['_eventlet_recv_event'] = _BlockedThread()
+        self.__dict__['_eventlet_send_lock'] = _QueueLock()
+        self.__dict__['_eventlet_recv_lock'] = _QueueLock()
 
         def event(fd):
             # Some events arrived at the zmq socket. This may mean
@@ -214,14 +223,14 @@ class Socket(_Socket):
                 _Socket_getsockopt(self, EVENTS)
 
         hub = hubs.get_hub()
-        self._eventlet_listener = hub.add(hub.READ, self.getsockopt(FD), event)
+        self.__dict__['_eventlet_listener'] = hub.add(hub.READ, self.getsockopt(FD), event)
 
     @_wraps(_Socket.close)
     def close(self, linger=None):
         super(Socket, self).close(linger)
         if self._eventlet_listener is not None:
             hubs.get_hub().remove(self._eventlet_listener)
-            self._eventlet_listener = None
+            self.__dict__['_eventlet_listener'] = None
             # wake any blocked threads
             self._eventlet_send_event.wake()
             self._eventlet_recv_event.wake()