diff --git a/pycardano/transaction.py b/pycardano/transaction.py
index a5400dfd..fa324059 100644
--- a/pycardano/transaction.py
+++ b/pycardano/transaction.py
@@ -436,7 +436,7 @@ def from_primitive(
     ) -> TransactionOutput:
         if isinstance(value, list):
             output = _TransactionOutputLegacy.from_primitive(value)
-            return cls(output.address, output.amount, datum=output.datum_hash)
+            return cls(output.address, output.amount, datum_hash=output.datum_hash)
         else:
             output = _TransactionOutputPostAlonzo.from_primitive(value)
             datum = output.datum.datum if output.datum else None