diff --git a/lib/transactions.js b/lib/transactions.js
index 505695a..f16b681 100644
--- a/lib/transactions.js
+++ b/lib/transactions.js
@@ -140,7 +140,8 @@ TxController.prototype.transformOutput = function(output, index) {
       //reqSigs: null, // TODO
     },
     spentTxId: output.__spentTxId,
-    spentIndex: output.__spentIndex
+    spentIndex: output.__spentIndex,
+    spentHeight: output.__spentHeight
     //spentTs: undefined // TODO
   };