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-rw-r--r--src/lib/net/socket.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/lib/net/socket.h b/src/lib/net/socket.h
index 99b0de4ff9..cb0ccbe817 100644
--- a/src/lib/net/socket.h
+++ b/src/lib/net/socket.h
@@ -113,4 +113,8 @@ STATIC int tor_ersatz_socketpair(int family, int type, int protocol,
#endif
#endif /* defined(COMPAT_PRIVATE) */
+#if defined(_WIN32) && !defined(SIO_IDEAL_SEND_BACKLOG_QUERY)
+#define SIO_IDEAL_SEND_BACKLOG_QUERY 0x4004747b
+#endif
+
#endif