diff --git a/src/microhttpd/mhd_send.c b/src/microhttpd/mhd_send.c
index 8eec8234..dc7414c6 100644
--- a/src/microhttpd/mhd_send.c
+++ b/src/microhttpd/mhd_send.c
@@ -250,7 +250,7 @@ MHD_send_on_connection_ (struct MHD_Connection *connection,
   {
     /* plaintext transmission */
     pre_cork_setsockopt (connection, want_cork);
-#if MSG_MORE
+#if HAVE_MSG_MORE
     ret = send (s,
                 buffer,
                 buffer_size,