1 files changed, 5 insertions, 0 deletions
diff --git a/core/vm/stack.go b/core/vm/stack.go
index f6c1f76e4..2d1b7bb82 100644
--- a/core/vm/stack.go
+++ b/core/vm/stack.go
@@ -68,6 +68,11 @@ func (st *Stack) peek() *big.Int {
 	return st.data[st.len()-1]
 }
 
+// Back returns the n'th item in stack
+func (st *Stack) Back(n int) *big.Int {
+	return st.data[st.len()-n-1]
+}
+
 func (st *Stack) require(n int) error {
 	if st.len() < n {
 		return fmt.Errorf("stack underflow (%d <=> %d)", len(st.data), n)