diff --git a/electrum/transaction.py b/electrum/transaction.py
index 62e853a7b..288211957 100644
--- a/electrum/transaction.py
+++ b/electrum/transaction.py
@@ -145,7 +145,7 @@ class TxOutput:
             return cls.from_address_and_value(addr, val)
         if _type == TYPE_SCRIPT:
             return cls(scriptpubkey=bfh(addr), value=val)
-        raise Exception(f"unexptected legacy address type: {_type}")
+        raise Exception(f"unexpected legacy address type: {_type}")
 
     @property
     def address(self) -> Optional[str]:
diff --git a/electrum/wallet.py b/electrum/wallet.py
index 6a2effac0..d12f73db9 100644
--- a/electrum/wallet.py
+++ b/electrum/wallet.py
@@ -2276,7 +2276,7 @@ class Abstract_Wallet(AddressSynchronizer, ABC):
         expiration = expiration or 0
         return OnchainInvoice(
             type=PR_TYPE_ONCHAIN,
-            outputs=[(TYPE_ADDRESS, address, amount_sat)],
+            outputs=[PartialTxOutput.from_address_and_value(address, amount_sat)],
             message=message,
             time=timestamp,
             amount_sat=amount_sat,