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-rw-r--r--slirp/tcp.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/slirp/tcp.h b/slirp/tcp.h
index 2e2b4033a6..61befcde57 100644
--- a/slirp/tcp.h
+++ b/slirp/tcp.h
@@ -106,6 +106,8 @@ struct tcphdr {
  */
 #undef TCP_MSS
 #define	TCP_MSS	1460
+#undef TCP6_MSS
+#define TCP6_MSS 1440
 
 #undef TCP_MAXWIN
 #define	TCP_MAXWIN	65535	/* largest value for (unscaled) window */