diff --git a/p4src/static-mapping.p4 b/p4src/static-mapping.p4
index ec52112..a4966eb 100644
--- a/p4src/static-mapping.p4
+++ b/p4src/static-mapping.p4
@@ -158,7 +158,7 @@ Echo or Echo Reply Message
     action nat46_icmp_generic()
     {
         hdr.icmp6.setValid();
-        hdr.ipv6.protocol = PROTO_ICMP6;
+        hdr.ipv6.next_header = PROTO_ICMP6;
 
         meta.chk_icmp6 = true;