From e373f505966c01d02d595963d4dead847745633e Mon Sep 17 00:00:00 2001
From: SomberNight <SomberNight@users.noreply.github.com>
Date: Wed, 22 Nov 2017 01:15:01 +0100
Subject: [PATCH] follow-up prev commit

---
 lib/transaction.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/transaction.py b/lib/transaction.py
index 8a44e3ff5..f4f359b6e 100644
--- a/lib/transaction.py
+++ b/lib/transaction.py
@@ -863,7 +863,8 @@ class Transaction:
         if not self.is_segwit():
             return 0
         inputs = self.inputs()
-        witness = ''.join(self.serialize_witness(x, True) for x in inputs)
+        estimate = not self.is_complete()
+        witness = ''.join(self.serialize_witness(x, estimate) for x in inputs)
         witness_size = len(witness) // 2 + 2  # include marker and flag
         return witness_size