diff --git a/core/vm/instructions.go b/core/vm/instructions.go
index 023aa0af0..b8055de6b 100644
--- a/core/vm/instructions.go
+++ b/core/vm/instructions.go
@@ -17,6 +17,8 @@
 package vm
 
 import (
+	"math"
+
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
@@ -359,7 +361,7 @@ func opCodeCopy(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([
 	)
 	uint64CodeOffset, overflow := codeOffset.Uint64WithOverflow()
 	if overflow {
-		uint64CodeOffset = 0xffffffffffffffff
+		uint64CodeOffset = math.MaxUint64
 	}
 	codeCopy := getData(scope.Contract.Code, uint64CodeOffset, length.Uint64())
 	scope.Memory.Set(memOffset.Uint64(), length.Uint64(), codeCopy)
@@ -377,7 +379,7 @@ func opExtCodeCopy(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext)
 	)
 	uint64CodeOffset, overflow := codeOffset.Uint64WithOverflow()
 	if overflow {
-		uint64CodeOffset = 0xffffffffffffffff
+		uint64CodeOffset = math.MaxUint64
 	}
 	addr := common.Address(a.Bytes20())
 	codeCopy := getData(interpreter.evm.StateDB.GetCode(addr), uint64CodeOffset, length.Uint64())