diff --git a/ethutil/value.go b/ethutil/value.go
index 6417b0008..7d4a7d98c 100644
--- a/ethutil/value.go
+++ b/ethutil/value.go
@@ -397,5 +397,5 @@ func (it *ValueIterator) Value() *Value {
 }
 
 func (it *ValueIterator) Idx() int {
-	return it.idx
+	return it.idx - 1
 }