diff --git a/p4src/checksums.p4 b/p4src/checksums.p4
index af4e4cc..798e974 100644
--- a/p4src/checksums.p4
+++ b/p4src/checksums.p4
@@ -22,7 +22,7 @@ control MyVerifyChecksum(inout headers hdr, inout metadata meta) {
 control MyComputeChecksum(inout headers  hdr, inout metadata meta) {
     apply {
 
-        update_checksum_with_payload(meta.chk_icmp6 == true,
+        update_checksum_with_payload(meta.chk_icmp6 == 1,
 		 	{
                 hdr.ipv6.src_addr,         /* 128 */
 		 		hdr.ipv6.dst_addr,         /* 128 */
@@ -61,7 +61,7 @@ control MyComputeChecksum(inout headers  hdr, inout metadata meta) {
             HashAlgorithm.csum16
         );
 
-        update_checksum_with_payload(meta.chk_icmp == true,
+        update_checksum_with_payload(meta.chk_icmp == 1,
 		 	{
                 hdr.icmp.type,
                 hdr.icmp.code
diff --git a/p4src/headers.p4 b/p4src/headers.p4
index 12132c2..a8271a7 100644
--- a/p4src/headers.p4
+++ b/p4src/headers.p4
@@ -182,8 +182,8 @@ struct metadata {
 
     /* migrate tasks to bool */
     bit<1> chk_icmp6_na_ns;
-    bool chk_icmp6;
-    bool chk_icmp;
+    bit<1> chk_icmp6;
+    bit<1> chk_icmp;
 
     bit<16> tcp_length;
     bit<32> cast_length;
diff --git a/p4src/parsers.p4 b/p4src/parsers.p4
index a21a986..f3a33f9 100644
--- a/p4src/parsers.p4
+++ b/p4src/parsers.p4
@@ -14,8 +14,8 @@ parser MyParser(packet_in packet,
 
     state start {
 
-        meta.chk_icmp        = false;
-        meta.chk_icmp6       = false;
+        meta.chk_icmp        = 0;
+        meta.chk_icmp6       = 0;
         meta.chk_icmp6_na_ns = 0;
 
         packet.extract(hdr.ethernet);