diff --git a/p4src/checksums.p4 b/p4src/checksums.p4
index 3af0f81..d456ab5 100644
--- a/p4src/checksums.p4
+++ b/p4src/checksums.p4
@@ -25,7 +25,8 @@ control MyComputeChecksum(inout headers  hdr, inout metadata meta) {
 		 	{
                 hdr.ipv6.src_addr,         /* 128 */
 		 		hdr.ipv6.dst_addr,         /* 128 */
-                meta.cast_length,          /* 32 */
+                16w0,                      /* 16 try implicit cast */
+                hdr.ipv6.payload_length,   /* 16 */
                 24w0,                      /* 24 0's */
                 PROTO_ICMP6                /* 8 */
             },
diff --git a/p4src/static-mapping.p4 b/p4src/static-mapping.p4
index 36c67c5..af06ad6 100644
--- a/p4src/static-mapping.p4
+++ b/p4src/static-mapping.p4
@@ -63,7 +63,7 @@ control MyIngress(inout headers hdr,
         hdr.icmp6.type = ICMP6_ECHO_REPLY;
 
         meta.calc_icmp6_checksum = true;
-        meta.cast_length = (bit<32>) hdr.ipv6.payload_length;
+        //meta.cast_length = (bit<32>) hdr.ipv6.payload_length;
     }
 
     /********************** Reply to NDP for US ***********************************/