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-rw-r--r--src/common/compat.h3
-rw-r--r--src/lib/net/socket.h4
2 files changed, 4 insertions, 3 deletions
diff --git a/src/common/compat.h b/src/common/compat.h
index a29a3242b7..6ac958c01f 100644
--- a/src/common/compat.h
+++ b/src/common/compat.h
@@ -10,9 +10,6 @@
#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
-#ifndef SIO_IDEAL_SEND_BACKLOG_QUERY
-#define SIO_IDEAL_SEND_BACKLOG_QUERY 0x4004747b
-#endif
#endif
#include "lib/cc/torint.h"
#include "lib/testsupport/testsupport.h"
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