diff --git a/p4src/nat64.p4 b/p4src/nat64.p4
index 2e86d08..f03612d 100644
--- a/p4src/nat64.p4
+++ b/p4src/nat64.p4
@@ -526,6 +526,7 @@ Echo or Echo Reply Message
                 if(hdr.tcp.isValid()) {
                     if(nat64_tcp_session.apply().hit) {
                         meta.chk_tcp_v4 = 1;
+                        v4_networks.apply();       /* apply egress for IPv4 */
                     }
                 }
                 // if(hdr.icmp6.isValid()) {