diff --git a/src/wallet/asyncrpcoperation_sendmany.cpp b/src/wallet/asyncrpcoperation_sendmany.cpp
index a78fefb51..03507c7d5 100644
--- a/src/wallet/asyncrpcoperation_sendmany.cpp
+++ b/src/wallet/asyncrpcoperation_sendmany.cpp
@@ -120,11 +120,6 @@ AsyncRPCOperation_sendmany::AsyncRPCOperation_sendmany(
         LogPrint("zrpc", "%s: z_sendmany initialized\n", getId());
     }
 
-    // Lock UTXOs
-    lock_utxos();
-    // Lock shielded input notes
-    lock_notes();
-    LogPrint("zrpc", "%s: z_sendmany input notes locked\n", getId());
 }
 
 AsyncRPCOperation_sendmany::~AsyncRPCOperation_sendmany() {
@@ -240,6 +235,15 @@ bool AsyncRPCOperation_sendmany::main_impl() {
         throw JSONRPCError(RPC_WALLET_INSUFFICIENT_FUNDS, "Insufficient funds, no unspent notes found for zaddr from address.");
     }
 
+    // Now that find_unspent_notes() has run, we now know which
+    // notes need to be locked
+
+    // Lock UTXOs
+    lock_utxos();
+    // Lock shielded input notes
+    lock_notes();
+    LogPrint("zrpc", "%s: z_sendmany input notes locked\n", getId());
+
     CAmount t_inputs_total = 0;
     for (SendManyInputUTXO & t : t_inputs_) {
         t_inputs_total += std::get<2>(t);
@@ -802,7 +806,7 @@ void AsyncRPCOperation_sendmany::unlock_utxos() {
 // Lock input notes
 void AsyncRPCOperation_sendmany::lock_notes() {
     LOCK2(cs_main, pwalletMain->cs_wallet);
-    fprintf(stderr,"%s: found %d notes to lock\n", z_sapling_inputs_.count() );
+    fprintf(stderr,"%s: found %lu notes to lock\n", __func__, z_sapling_inputs_.size() );
     for (auto note : z_sapling_inputs_) {
         pwalletMain->LockNote(note.op);
     }
@@ -811,7 +815,7 @@ void AsyncRPCOperation_sendmany::lock_notes() {
 // Unlock input notes
 void AsyncRPCOperation_sendmany::unlock_notes() {
     LOCK2(cs_main, pwalletMain->cs_wallet);
-    fprintf(stderr,"%s: found %d notes to unlock\n", z_sapling_inputs_.count() );
+    fprintf(stderr,"%s: found %lu notes to unlock\n", __func__, z_sapling_inputs_.size() );
     for (auto note : z_sapling_inputs_) {
         pwalletMain->UnlockNote(note.op);
     }