diff --git a/core/vm/contract.go b/core/vm/contract.go
index d7cbafcf7f..2f49c8f481 100644
--- a/core/vm/contract.go
+++ b/core/vm/contract.go
@@ -17,6 +17,7 @@
 package vm
 
 import (
+	"math"
 	"math/big"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -146,7 +147,7 @@ func (c *Contract) AsDelegate() *Contract {
 
 // GetOp returns the n'th element in the contract's byte array
 func (c *Contract) GetOp(n uint64) OpCode {
-	if len(c.Code) > 0 && len(c.Code) <= 64*1024*1024 && n < uint64(len(c.Code)) {
+	if len(c.Code) > 0 && len(c.Code) <= math.MaxUint8 && n < uint64(len(c.Code)) {
 			return OpCode(c.Code[n])
 	}