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-rw-r--r--lib/transfer.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/transfer.c b/lib/transfer.c
index c7f4ef9f3..b73f94d9e 100644
--- a/lib/transfer.c
+++ b/lib/transfer.c
@@ -879,7 +879,7 @@ static CURLcode done_sending(struct connectdata *conn,
return CURLE_OK;
}
-#ifdef WIN32
+#if defined(WIN32) && !defined(USE_LWIPSOCK)
#ifndef SIO_IDEAL_SEND_BACKLOG_QUERY
#define SIO_IDEAL_SEND_BACKLOG_QUERY 0x4004747B
#endif