diff -r 587fd4b91120 Lib/socket.py
--- a/Lib/socket.py	Tue Feb 18 12:37:12 2014 -0800
+++ b/Lib/socket.py	Tue Feb 18 23:10:23 2014 +0200
@@ -66,12 +66,18 @@
 # Note that _socket only knows about the integer values. The public interface
 # in this module understands the enums and translates them back from integers
 # where needed (e.g. .family property of a socket object).
-AddressFamily = IntEnum('AddressFamily',
+class _PickledByNameIntEnum(IntEnum):
+    def __reduce_ex__(self, proto):
+        if proto < 4:
+            return getattr, (self.__class__, self.name)
+        return self.__class__.__qualname__ + '.' + self.name
+
+AddressFamily = _PickledByNameIntEnum('AddressFamily',
                         {name: value for name, value in globals().items()
                          if name.isupper() and name.startswith('AF_')})
 globals().update(AddressFamily.__members__)
 
-SocketType = IntEnum('SocketType',
+SocketType = _PickledByNameIntEnum('SocketType',
                      {name: value for name, value in globals().items()
                       if name.isupper() and name.startswith('SOCK_')})
 globals().update(SocketType.__members__)