diff --git a/test/tx-test.js b/test/tx-test.js
index b4dfbc3c..8940a984 100644
--- a/test/tx-test.js
+++ b/test/tx-test.js
@@ -471,6 +471,7 @@ describe('TX', function() {
     assert.throws(function() {
       tx.fromRaw(raw);
     });
+    delete tx._raw;
     tx.outputs[0].value = new bn('00ffffffffffffff', 'hex').ineg();
     assert(tx.outputs[0].value.bitLength() === 56);
     var raw = tx.toRaw()