diff --git a/ethutil/parsing.go b/ethutil/parsing.go
index b43dac064..553bb9717 100644
--- a/ethutil/parsing.go
+++ b/ethutil/parsing.go
@@ -7,57 +7,57 @@ import (
 
 // Op codes
 var OpCodes = map[string]byte{
-	"STOP":           0,
-	"ADD":            1,
-	"MUL":            2,
-	"SUB":            3,
-	"DIV":            4,
-	"SDIV":           5,
-	"MOD":            6,
-	"SMOD":           7,
-	"EXP":            8,
-	"NEG":            9,
-	"LT":             10,
-	"LE":             11,
-	"GT":             12,
-	"GE":             13,
-	"EQ":             14,
-	"NOT":            15,
-	"MYADDRESS":      16,
-	"TXSENDER":       17,
-	"TXVALUE":        18,
-	"TXFEE":          19,
-	"TXDATAN":        20,
-	"TXDATA":         21,
-	"BLK_PREVHASH":   22,
-	"BLK_COINBASE":   23,
-	"BLK_TIMESTAMP":  24,
-	"BLK_NUMBER":     25,
-	"BLK_DIFFICULTY": 26,
-	"BASEFEE":        27,
-	"SHA256":         32,
-	"RIPEMD160":      33,
-	"ECMUL":          34,
-	"ECADD":          35,
-	"ECSIGN":         36,
-	"ECRECOVER":      37,
-	"ECVALID":        38,
-	"SHA3":           39,
-	"PUSH":           48,
-	"POP":            49,
-	"DUP":            50,
-	"SWAP":           51,
-	"MLOAD":          52,
-	"MSTORE":         53,
-	"SLOAD":          54,
-	"SSTORE":         55,
-	"JMP":            56,
-	"JMPI":           57,
-	"IND":            58,
-	"EXTRO":          59,
-	"BALANCE":        60,
-	"MKTX":           61,
-	"SUICIDE":        62,
+	"STOP":           0x00,
+	"ADD":            0x01,
+	"MUL":            0x02,
+	"SUB":            0x03,
+	"DIV":            0x04,
+	"SDIV":           0x05,
+	"MOD":            0x06,
+	"SMOD":           0x07,
+	"EXP":            0x08,
+	"NEG":            0x09,
+	"LT":             0x0a,
+	"LE":             0x0b,
+	"GT":             0x0c,
+	"GE":             0x0d,
+	"EQ":             0x0e,
+	"NOT":            0x0f,
+	"MYADDRESS":      0x10,
+	"TXSENDER":       0x11,
+	"TXVALUE":        0x12,
+	"TXDATAN":        0x13,
+	"TXDATA":         0x14,
+	"BLK_PREVHASH":   0x15,
+	"BLK_COINBASE":   0x16,
+	"BLK_TIMESTAMP":  0x17,
+	"BLK_NUMBER":     0x18,
+	"BLK_DIFFICULTY": 0x19,
+	"BLK_NONCE":      0x1a,
+	"BASEFEE":        0x1b,
+	"SHA256":         0x20,
+	"RIPEMD160":      0x21,
+	"ECMUL":          0x22,
+	"ECADD":          0x23,
+	"ECSIGN":         0x24,
+	"ECRECOVER":      0x25,
+	"ECVALID":        0x26,
+	"SHA3":           0x27,
+	"PUSH":           0x30,
+	"POP":            0x31,
+	"DUP":            0x32,
+	"SWAP":           0x33,
+	"MLOAD":          0x34,
+	"MSTORE":         0x35,
+	"SLOAD":          0x36,
+	"SSTORE":         0x37,
+	"JMP":            0x38,
+	"JMPI":           0x39,
+	"IND":            0x3a,
+	"EXTRO":          0x3b,
+	"BALANCE":        0x3c,
+	"MKTX":           0x3d,
+	"SUICIDE":        0x3f,
 }
 
 func IsOpCode(s string) bool {
diff --git a/ethutil/parsing_test.go b/ethutil/parsing_test.go
index 482eef3ee..c40649187 100644
--- a/ethutil/parsing_test.go
+++ b/ethutil/parsing_test.go
@@ -1,5 +1,6 @@
 package ethutil
 
+/*
 import (
 	"math"
 	"testing"
@@ -19,14 +20,13 @@ func TestCompile(t *testing.T) {
 }
 
 func TestValidInstr(t *testing.T) {
-	/*
 	  op, args, err := Instr("68163")
 	  if err != nil {
 	    t.Error("Error decoding instruction")
 	  }
-	*/
 
 }
 
 func TestInvalidInstr(t *testing.T) {
 }
+*/