diff --git a/src/psbt.h b/src/psbt.h
index ea35516b96c..f9d49d80500 100644
--- a/src/psbt.h
+++ b/src/psbt.h
@@ -1345,7 +1345,7 @@ struct PartiallySignedTransaction
             SerializeToVector(s, CompactSizeWriter(PSBT_GLOBAL_UNSIGNED_TX));
 
             // Write serialized tx to a stream
-            SerializeToVector(s, TX_NO_WITNESS(*tx));
+            SerializeToVector(s, TX_NO_WITNESS(GetUnsignedTx()));
         }
 
         // Write xpubs