diff --git a/lib/wallet.py b/lib/wallet.py
index c9acd2217..f1ad7b5cf 100644
--- a/lib/wallet.py
+++ b/lib/wallet.py
@@ -146,6 +146,7 @@ def sweep(privkeys, network, config, recipient, fee=None, imax=100):
     locktime = network.get_local_height()
 
     tx = Transaction.from_io(inputs, outputs, locktime=locktime)
+    tx.BIP_LI01_sort()
     tx.set_rbf(True)
     tx.sign(keypairs)
     return tx
@@ -1080,7 +1081,9 @@ class Abstract_Wallet(PrintError):
         if delta > 0:
             raise BaseException(_('Cannot bump fee: could not find suitable outputs'))
         locktime = self.get_local_height()
-        return Transaction.from_io(inputs, outputs, locktime=locktime)
+        tx_new = Transaction.from_io(inputs, outputs, locktime=locktime)
+        tx_new.BIP_LI01_sort()
+        return tx_new
 
     def cpfp(self, tx, fee):
         txid = tx.txid()
@@ -1098,6 +1101,7 @@ class Abstract_Wallet(PrintError):
         inputs = [item]
         outputs = [(TYPE_ADDRESS, address, value - fee)]
         locktime = self.get_local_height()
+        # note: no need to call tx.BIP_LI01_sort() here - single input/output
         return Transaction.from_io(inputs, outputs, locktime=locktime)
 
     def add_input_info(self, txin):