diff --git a/README.md b/README.md
index 845b290..2fd69f5 100644
--- a/README.md
+++ b/README.md
@@ -259,7 +259,7 @@ cat arp.cache | ./sx udp --json -p 53 192.168.0.171
 sample output:
 
 ```
-{"scan":"udp","ip":"192.168.0.171","icmp":{"Type":3,"Code":3}}
+{"scan":"udp","ip":"192.168.0.171","icmp":{"type":3,"code":3}}
 ```
 
 In this case we find out that host sent ICMP reply packet with **Destination Unreachable** type and **Port Unreachable** code (typical response for a closed port according to the rfc1122).
diff --git a/pkg/scan/icmp/icmp.go b/pkg/scan/icmp/icmp.go
index b18a157..494a32e 100644
--- a/pkg/scan/icmp/icmp.go
+++ b/pkg/scan/icmp/icmp.go
@@ -1,6 +1,6 @@
 package icmp
 
 type Response struct {
-	Type uint8
-	Code uint8
+	Type uint8 `json:"type"`
+	Code uint8 `json:"code"`
 }
diff --git a/pkg/scan/udp/result_easyjson.go b/pkg/scan/udp/result_easyjson.go
index c9e1830..ad1d0c4 100644
--- a/pkg/scan/udp/result_easyjson.go
+++ b/pkg/scan/udp/result_easyjson.go
@@ -129,9 +129,9 @@ func easyjsonD3b49167DecodeGithubComVByteCpuSxPkgScanIcmp(in *jlexer.Lexer, out
 			continue
 		}
 		switch key {
-		case "Type":
+		case "type":
 			out.Type = uint8(in.Uint8())
-		case "Code":
+		case "code":
 			out.Code = uint8(in.Uint8())
 		default:
 			in.SkipRecursive()
@@ -148,12 +148,12 @@ func easyjsonD3b49167EncodeGithubComVByteCpuSxPkgScanIcmp(out *jwriter.Writer, i
 	first := true
 	_ = first
 	{
-		const prefix string = ",\"Type\":"
+		const prefix string = ",\"type\":"
 		out.RawString(prefix[1:])
 		out.Uint8(uint8(in.Type))
 	}
 	{
-		const prefix string = ",\"Code\":"
+		const prefix string = ",\"code\":"
 		out.RawString(prefix)
 		out.Uint8(uint8(in.Code))
 	}