diff --git a/libs/tornado/netutil.py b/libs/tornado/netutil.py
index 1e1bcbf9..dcffd4a3 100644
--- a/libs/tornado/netutil.py
+++ b/libs/tornado/netutil.py
@@ -238,12 +238,6 @@ def bind_sockets(port, address=None, family=socket.AF_UNSPEC, backlog=128):
     if address == "":
         address = None
     flags = socket.AI_PASSIVE
-    if hasattr(socket, "AI_ADDRCONFIG"):
-        # AI_ADDRCONFIG ensures that we only try to bind on ipv6
-        # if the system is configured for it, but the flag doesn't
-        # exist on some platforms (specifically WinXP, although
-        # newer versions of windows have it)
-        flags |= socket.AI_ADDRCONFIG
     for res in set(socket.getaddrinfo(address, port, family, socket.SOCK_STREAM,
                                   0, flags)):
         af, socktype, proto, canonname, sockaddr = res