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-rw-r--r--slirp/tcp_input.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/slirp/tcp_input.c b/slirp/tcp_input.c
index edb98f06f3..07bcbdb2dd 100644
--- a/slirp/tcp_input.c
+++ b/slirp/tcp_input.c
@@ -1587,11 +1587,11 @@ tcp_mss(struct tcpcb *tp, u_int offer)
switch (so->so_ffamily) {
case AF_INET:
mss = MIN(IF_MTU, IF_MRU) - sizeof(struct tcphdr)
- + sizeof(struct ip);
+ - sizeof(struct ip);
break;
case AF_INET6:
mss = MIN(IF_MTU, IF_MRU) - sizeof(struct tcphdr)
- + sizeof(struct ip6);
+ - sizeof(struct ip6);
break;
default:
g_assert_not_reached();