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-rw-r--r--vm/vm_debug.go2
1 files changed, 1 insertions, 1 deletions
diff --git a/vm/vm_debug.go b/vm/vm_debug.go
index 129ea1a59..05ae347f6 100644
--- a/vm/vm_debug.go
+++ b/vm/vm_debug.go
@@ -394,7 +394,7 @@ func (self *DebugVm) RunClosure(closure *Closure) (ret []byte, err error) {
stack.Push(base)
case SIGNEXTEND:
back := stack.Pop().Uint64()
- if back.Cmp(big.NewInt(31)) < 0 {
+ if back < 31 {
bit := uint(back*8 + 7)
num := stack.Pop()
mask := new(big.Int).Lsh(ethutil.Big1, bit)