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-rw-r--r--src/plugins/nat/nat64_in2out.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/plugins/nat/nat64_in2out.c b/src/plugins/nat/nat64_in2out.c
index ddbf5850c7c..e843fcf6730 100644
--- a/src/plugins/nat/nat64_in2out.c
+++ b/src/plugins/nat/nat64_in2out.c
@@ -239,6 +239,7 @@ nat64_in2out_tcp_udp_set_cb (ip6_header_t * ip6, ip4_header_t * ip4,
checksum = &tcp->checksum;
csum = ip_csum_sub_even (*checksum, sport);
csum = ip_csum_add_even (csum, udp->src_port);
+ mss_clamping (nm->sm, tcp, &csum);
*checksum = ip_csum_fold (csum);
}