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-rw-r--r--lib/transfer.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/transfer.c b/lib/transfer.c
index 1d33e861a..49f32568f 100644
--- a/lib/transfer.c
+++ b/lib/transfer.c
@@ -869,7 +869,11 @@ static CURLcode done_sending(struct connectdata *conn,
return CURLE_OK;
}
-#if defined(WIN32) && defined(SIO_IDEAL_SEND_BACKLOG_QUERY)
+#ifdef WIN32
+#ifndef SIO_IDEAL_SEND_BACKLOG_QUERY
+#define SIO_IDEAL_SEND_BACKLOG_QUERY 0x4004747B
+#endif
+
static void win_update_buffer_size(curl_socket_t sockfd)
{
int result;