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-rw-r--r--core/vm/instructions.go4
1 files changed, 2 insertions, 2 deletions
diff --git a/core/vm/instructions.go b/core/vm/instructions.go
index bcaf18e8a..f5164fcdd 100644
--- a/core/vm/instructions.go
+++ b/core/vm/instructions.go
@@ -258,8 +258,8 @@ func opXor(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stac
func opByte(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
th, val := stack.pop(), stack.peek()
if th.Cmp(common.Big32) < 0 {
- b := math.BigEndian32ByteAt(val, int(th.Int64()))
- val.SetInt64(int64(b))
+ b := math.Byte(val, 32, int(th.Int64()))
+ val.SetUint64(uint64(b))
} else {
val.SetUint64(0)
}