diff --git a/lib/transaction.py b/lib/transaction.py
index 4f6eccf2..d62ea91e 100644
--- a/lib/transaction.py
+++ b/lib/transaction.py
@@ -831,6 +831,7 @@ class Transaction:
                     assert public_key.verify_digest(sig, pre_hash, sigdecode = ecdsa.util.sigdecode_der)
                     txin['signatures'][j] = sig.encode('hex') + '01'
                     txin['x_pubkeys'][j] = pubkey
+                    txin['pubkeys'][j] = pubkey # needed for fd keys
                     self._inputs[i] = txin
         print_error("is_complete", self.is_complete())
         self.raw = self.serialize()