diff --git a/src/mining/merkle_tree.go b/src/mining/merkle_tree.go
index 07022ce..8a7c255 100644
--- a/src/mining/merkle_tree.go
+++ b/src/mining/merkle_tree.go
@@ -75,8 +75,7 @@ func CalcMerkleRoot(transactions []*transaction.Transaction, witness bool) [32]b
     for _ ,t := range transactions {
         if(t.Vin[0].IsCoinbase) {
             txids = append(txids, zeroHash)
-        }
-        if(witness){
+        } else if(witness){
             txids = append(txids, [32]byte(utils.DoubleHash(t.RawHex())))
         } else {
             txids = append(txids, [32]byte(utils.ReverseBytes(t.TxHash())))