diff --git a/src/wallet/spend.cpp b/src/wallet/spend.cpp
index 7abf7f59c08..aceed24a86c 100644
--- a/src/wallet/spend.cpp
+++ b/src/wallet/spend.cpp
@@ -1167,6 +1167,7 @@ static util::Result<CreatedTransactionResult> CreateTransactionInternal(
            result.GetSelectedValue());
 
     // vouts to the payees
+    txNew.vout.reserve(vecSend.size() + 1); // + 1 because of possible later insert
     for (const auto& recipient : vecSend)
     {
         txNew.vout.emplace_back(recipient.nAmount, GetScriptForDestination(recipient.dest));
@@ -1217,6 +1218,7 @@ static util::Result<CreatedTransactionResult> CreateTransactionInternal(
     // behavior."
     bool use_anti_fee_sniping = true;
     const uint32_t default_sequence{coin_control.m_signal_bip125_rbf.value_or(wallet.m_signal_rbf) ? MAX_BIP125_RBF_SEQUENCE : CTxIn::MAX_SEQUENCE_NONFINAL};
+    txNew.vin.reserve(selected_coins.size());
     for (const auto& coin : selected_coins) {
         std::optional<uint32_t> sequence = coin_control.GetSequence(coin->outpoint);
         if (sequence) {