diff --git a/src/bench/wallet_balance.cpp b/src/bench/wallet_balance.cpp
index 867be7296b..d7cc167885 100644
--- a/src/bench/wallet_balance.cpp
+++ b/src/bench/wallet_balance.cpp
@@ -5,13 +5,14 @@
 #include <bench/bench.h>
 #include <interfaces/chain.h>
 #include <node/context.h>
-#include <optional>
 #include <test/util/mining.h>
 #include <test/util/setup_common.h>
 #include <test/util/wallet.h>
 #include <validationinterface.h>
 #include <wallet/wallet.h>
 
+#include <optional>
+
 static void WalletBalance(benchmark::Bench& bench, const bool set_dirty, const bool add_watchonly, const bool add_mine)
 {
     const auto test_setup = MakeNoLogFileContext<const TestingSetup>();
diff --git a/src/bitcoin-cli.cpp b/src/bitcoin-cli.cpp
index de3c73c78a..ecd08c62eb 100644
--- a/src/bitcoin-cli.cpp
+++ b/src/bitcoin-cli.cpp
@@ -9,7 +9,6 @@
 
 #include <chainparamsbase.h>
 #include <clientversion.h>
-#include <optional>
 #include <rpc/client.h>
 #include <rpc/mining.h>
 #include <rpc/protocol.h>
@@ -24,6 +23,7 @@
 #include <cmath>
 #include <functional>
 #include <memory>
+#include <optional>
 #include <stdio.h>
 #include <string>
 #include <tuple>
diff --git a/src/bitcoind.cpp b/src/bitcoind.cpp
index 32f06aec2c..1b4ca3e9a8 100644
--- a/src/bitcoind.cpp
+++ b/src/bitcoind.cpp
@@ -25,6 +25,7 @@
 #include <util/url.h>
 
 #include <functional>
+#include <optional>
 
 const std::function<std::string(const char*)> G_TRANSLATION_FUN = nullptr;
 UrlDecodeFn* const URL_DECODE = urlDecode;
diff --git a/src/interfaces/chain.h b/src/interfaces/chain.h
index 50294ee375..3395741b1b 100644
--- a/src/interfaces/chain.h
+++ b/src/interfaces/chain.h
@@ -5,12 +5,12 @@
 #ifndef BITCOIN_INTERFACES_CHAIN_H
 #define BITCOIN_INTERFACES_CHAIN_H
 
-#include <optional>               // For Optional and nullopt
 #include <primitives/transaction.h> // For CTransactionRef
 #include <util/settings.h>          // For util::SettingsValue
 
 #include <functional>
 #include <memory>
+#include <optional>
 #include <stddef.h>
 #include <stdint.h>
 #include <string>
diff --git a/src/miner.cpp b/src/miner.cpp
index 53404e2b9d..fe7a54c052 100644
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -96,9 +96,6 @@ void BlockAssembler::resetBlock()
     nFees = 0;
 }
 
-std::optional<int64_t> BlockAssembler::m_last_block_num_txs{std::nullopt};
-std::optional<int64_t> BlockAssembler::m_last_block_weight{std::nullopt};
-
 std::unique_ptr<CBlockTemplate> BlockAssembler::CreateNewBlock(CChainState& chainstate, const CScript& scriptPubKeyIn)
 {
     int64_t nTimeStart = GetTimeMicros();
diff --git a/src/miner.h b/src/miner.h
index 236d792f1e..023635814c 100644
--- a/src/miner.h
+++ b/src/miner.h
@@ -6,12 +6,12 @@
 #ifndef BITCOIN_MINER_H
 #define BITCOIN_MINER_H
 
-#include <optional>
 #include <primitives/block.h>
 #include <txmempool.h>
 #include <validation.h>
 
 #include <memory>
+#include <optional>
 #include <stdint.h>
 
 #include <boost/multi_index_container.hpp>
@@ -160,8 +160,8 @@ public:
     /** Construct a new block template with coinbase to scriptPubKeyIn */
     std::unique_ptr<CBlockTemplate> CreateNewBlock(CChainState& chainstate, const CScript& scriptPubKeyIn);
 
-    static std::optional<int64_t> m_last_block_num_txs;
-    static std::optional<int64_t> m_last_block_weight;
+    inline static std::optional<int64_t> m_last_block_num_txs{};
+    inline static std::optional<int64_t> m_last_block_weight{};
 
 private:
     // utility functions
diff --git a/src/net.cpp b/src/net.cpp
index fb8e06d14b..6a2469f950 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -18,7 +18,6 @@
 #include <net_permissions.h>
 #include <netbase.h>
 #include <node/ui_interface.h>
-#include <optional>
 #include <protocol.h>
 #include <random.h>
 #include <scheduler.h>
@@ -39,6 +38,7 @@
 #include <algorithm>
 #include <cstdint>
 #include <functional>
+#include <optional>
 #include <unordered_map>
 
 #include <math.h>
@@ -752,7 +752,7 @@ std::optional<CNetMessage> V1TransportDeserializer::GetMessage(const std::chrono
         LogPrint(BCLog::NET, "HEADER ERROR - COMMAND (%s, %u bytes), peer=%d\n",
                  hdr.GetCommand(), msg->m_message_size, m_node_id);
         out_err_raw_size = msg->m_raw_message_size;
-        msg = std::nullopt;
+        msg.reset();
     }
 
     // Always reset the network deserializer (prepare for the next message)
diff --git a/src/net.h b/src/net.h
index 2eab20f243..48d37084a0 100644
--- a/src/net.h
+++ b/src/net.h
@@ -18,7 +18,6 @@
 #include <net_permissions.h>
 #include <netaddress.h>
 #include <netbase.h>
-#include <optional>
 #include <policy/feerate.h>
 #include <protocol.h>
 #include <random.h>
@@ -35,6 +34,7 @@
 #include <deque>
 #include <map>
 #include <memory>
+#include <optional>
 #include <thread>
 #include <vector>
 
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 4d9dc2204d..b600cc3a1a 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -34,6 +34,7 @@
 #include <validation.h>
 
 #include <memory>
+#include <optional>
 #include <typeinfo>
 
 /** How long to cache transactions in mapRelay for normal relay */
diff --git a/src/node/interfaces.cpp b/src/node/interfaces.cpp
index 7a4fa0a613..50c8c29175 100644
--- a/src/node/interfaces.cpp
+++ b/src/node/interfaces.cpp
@@ -50,6 +50,7 @@
 #endif
 
 #include <memory>
+#include <optional>
 #include <utility>
 
 using interfaces::BlockTip;
diff --git a/src/node/psbt.h b/src/node/psbt.h
index 009e0941e1..def4385c09 100644
--- a/src/node/psbt.h
+++ b/src/node/psbt.h
@@ -7,6 +7,8 @@
 
 #include <psbt.h>
 
+#include <optional>
+
 /**
  * Holds an analysis of one input from a PSBT
  */
@@ -28,9 +30,9 @@ struct PSBTAnalysis {
     std::optional<size_t> estimated_vsize;      //!< Estimated weight of the transaction
     std::optional<CFeeRate> estimated_feerate;  //!< Estimated feerate (fee / weight) of the transaction
     std::optional<CAmount> fee;                 //!< Amount of fee being paid by the transaction
-    std::vector<PSBTInputAnalysis> inputs; //!< More information about the individual inputs of the transaction
-    PSBTRole next;                         //!< Which of the BIP 174 roles needs to handle the transaction next
-    std::string error;                     //!< Error message
+    std::vector<PSBTInputAnalysis> inputs;      //!< More information about the individual inputs of the transaction
+    PSBTRole next;                              //!< Which of the BIP 174 roles needs to handle the transaction next
+    std::string error;                          //!< Error message
 
     void SetInvalid(std::string err_msg)
     {
diff --git a/src/psbt.h b/src/psbt.h
index 319eb48cb0..96ae39fdb8 100644
--- a/src/psbt.h
+++ b/src/psbt.h
@@ -7,13 +7,14 @@
 
 #include <attributes.h>
 #include <node/transaction.h>
-#include <optional>
 #include <policy/feerate.h>
 #include <primitives/transaction.h>
 #include <pubkey.h>
 #include <script/sign.h>
 #include <script/signingprovider.h>
 
+#include <optional>
+
 // Magic bytes
 static constexpr uint8_t PSBT_MAGIC_BYTES[5] = {'p', 's', 'b', 't', 0xff};
 
diff --git a/src/script/descriptor.cpp b/src/script/descriptor.cpp
index cfe1da12e8..30399dca51 100644
--- a/src/script/descriptor.cpp
+++ b/src/script/descriptor.cpp
@@ -17,6 +17,7 @@
 #include <util/vector.h>
 
 #include <memory>
+#include <optional>
 #include <string>
 #include <vector>
 
diff --git a/src/script/descriptor.h b/src/script/descriptor.h
index c8d9efb11f..332ae2f230 100644
--- a/src/script/descriptor.h
+++ b/src/script/descriptor.h
@@ -5,12 +5,12 @@
 #ifndef BITCOIN_SCRIPT_DESCRIPTOR_H
 #define BITCOIN_SCRIPT_DESCRIPTOR_H
 
-#include <optional>
 #include <outputtype.h>
 #include <script/script.h>
 #include <script/sign.h>
 #include <script/signingprovider.h>
 
+#include <optional>
 #include <vector>
 
 using ExtPubKeyMap = std::unordered_map<uint32_t, CExtPubKey>;
diff --git a/src/test/descriptor_tests.cpp b/src/test/descriptor_tests.cpp
index 791480a6c5..aecf955fee 100644
--- a/src/test/descriptor_tests.cpp
+++ b/src/test/descriptor_tests.cpp
@@ -10,6 +10,7 @@
 
 #include <boost/test/unit_test.hpp>
 
+#include <optional>
 #include <string>
 #include <vector>
 
diff --git a/src/test/fuzz/deserialize.cpp b/src/test/fuzz/deserialize.cpp
index 66b0fdc090..1290c78712 100644
--- a/src/test/fuzz/deserialize.cpp
+++ b/src/test/fuzz/deserialize.cpp
@@ -15,7 +15,6 @@
 #include <net.h>
 #include <netbase.h>
 #include <node/utxo_snapshot.h>
-#include <optional>
 #include <primitives/block.h>
 #include <protocol.h>
 #include <psbt.h>
@@ -26,6 +25,7 @@
 #include <version.h>
 
 #include <exception>
+#include <optional>
 #include <stdexcept>
 #include <stdint.h>
 #include <unistd.h>
diff --git a/src/test/fuzz/net.cpp b/src/test/fuzz/net.cpp
index dc2f1e2160..272f6415a9 100644
--- a/src/test/fuzz/net.cpp
+++ b/src/test/fuzz/net.cpp
@@ -7,7 +7,6 @@
 #include <net.h>
 #include <net_permissions.h>
 #include <netaddress.h>
-#include <optional>
 #include <protocol.h>
 #include <random.h>
 #include <test/fuzz/FuzzedDataProvider.h>
@@ -17,6 +16,7 @@
 #include <test/util/setup_common.h>
 
 #include <cstdint>
+#include <optional>
 #include <string>
 #include <vector>
 
diff --git a/src/test/fuzz/p2p_transport_deserializer.cpp b/src/test/fuzz/p2p_transport_deserializer.cpp
index c07cf9322e..3a1fdaad8f 100644
--- a/src/test/fuzz/p2p_transport_deserializer.cpp
+++ b/src/test/fuzz/p2p_transport_deserializer.cpp
@@ -10,6 +10,7 @@
 #include <cassert>
 #include <cstdint>
 #include <limits>
+#include <optional>
 #include <vector>
 
 void initialize_p2p_transport_deserializer()
diff --git a/src/test/fuzz/psbt.cpp b/src/test/fuzz/psbt.cpp
index e06f9d33bc..d1cc6f9c7e 100644
--- a/src/test/fuzz/psbt.cpp
+++ b/src/test/fuzz/psbt.cpp
@@ -5,7 +5,6 @@
 #include <test/fuzz/fuzz.h>
 
 #include <node/psbt.h>
-#include <optional>
 #include <psbt.h>
 #include <pubkey.h>
 #include <script/script.h>
@@ -13,6 +12,7 @@
 #include <version.h>
 
 #include <cstdint>
+#include <optional>
 #include <string>
 #include <vector>
 
diff --git a/src/test/fuzz/script_descriptor_cache.cpp b/src/test/fuzz/script_descriptor_cache.cpp
index 7c88fb2f47..6ce13d5679 100644
--- a/src/test/fuzz/script_descriptor_cache.cpp
+++ b/src/test/fuzz/script_descriptor_cache.cpp
@@ -2,7 +2,6 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#include <optional>
 #include <pubkey.h>
 #include <script/descriptor.h>
 #include <test/fuzz/FuzzedDataProvider.h>
@@ -10,6 +9,7 @@
 #include <test/fuzz/util.h>
 
 #include <cstdint>
+#include <optional>
 #include <string>
 #include <vector>
 
diff --git a/src/test/net_tests.cpp b/src/test/net_tests.cpp
index 4509d0b68c..3172f119bd 100644
--- a/src/test/net_tests.cpp
+++ b/src/test/net_tests.cpp
@@ -9,7 +9,6 @@
 #include <cstdint>
 #include <net.h>
 #include <netbase.h>
-#include <optional>
 #include <serialize.h>
 #include <span.h>
 #include <streams.h>
@@ -24,6 +23,7 @@
 #include <algorithm>
 #include <ios>
 #include <memory>
+#include <optional>
 #include <string>
 
 using namespace std::literals;
diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
index deb5e1e720..55f1069d0c 100644
--- a/src/test/util_tests.cpp
+++ b/src/test/util_tests.cpp
@@ -7,7 +7,6 @@
 #include <clientversion.h>
 #include <hash.h> // For Hash()
 #include <key.h>  // For CKey
-#include <optional>
 #include <sync.h>
 #include <test/util/logging.h>
 #include <test/util/setup_common.h>
@@ -23,6 +22,7 @@
 #include <util/vector.h>
 
 #include <array>
+#include <optional>
 #include <stdint.h>
 #include <string.h>
 #include <thread>
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index 5691a5faf5..faccd1ade0 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -8,7 +8,6 @@
 #include <consensus/consensus.h>
 #include <consensus/tx_verify.h>
 #include <consensus/validation.h>
-#include <optional>
 #include <policy/fees.h>
 #include <policy/policy.h>
 #include <policy/settings.h>
@@ -19,6 +18,8 @@
 #include <validation.h>
 #include <validationinterface.h>
 
+#include <optional>
+
 CTxMemPoolEntry::CTxMemPoolEntry(const CTransactionRef& _tx, const CAmount& _nFee,
                                  int64_t _nTime, unsigned int _entryHeight,
                                  bool _spendsCoinbase, int64_t _sigOpsCost, LockPoints lp)
@@ -894,7 +895,7 @@ std::optional<CTxMemPool::txiter> CTxMemPool::GetIter(const uint256& txid) const
 {
     auto it = mapTx.find(txid);
     if (it != mapTx.end()) return it;
-    return std::optional<txiter>{};
+    return {};
 }
 
 CTxMemPool::setEntries CTxMemPool::GetIterSet(const std::set<uint256>& hashes) const
diff --git a/src/txmempool.h b/src/txmempool.h
index 658efbce83..9d4ea760e7 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -8,6 +8,7 @@
 
 #include <atomic>
 #include <map>
+#include <optional>
 #include <set>
 #include <string>
 #include <utility>
@@ -16,7 +17,6 @@
 #include <amount.h>
 #include <coins.h>
 #include <indirectmap.h>
-#include <optional>
 #include <policy/feerate.h>
 #include <primitives/transaction.h>
 #include <random.h>
diff --git a/src/util/system.h b/src/util/system.h
index 4c965ce114..291f3f5541 100644
--- a/src/util/system.h
+++ b/src/util/system.h
@@ -19,7 +19,6 @@
 #include <compat/assumptions.h>
 #include <fs.h>
 #include <logging.h>
-#include <optional>
 #include <sync.h>
 #include <tinyformat.h>
 #include <util/settings.h>
@@ -28,6 +27,7 @@
 
 #include <exception>
 #include <map>
+#include <optional>
 #include <set>
 #include <stdint.h>
 #include <string>
diff --git a/src/util/tokenpipe.cpp b/src/util/tokenpipe.cpp
index 79465dd430..4c091cd2e6 100644
--- a/src/util/tokenpipe.cpp
+++ b/src/util/tokenpipe.cpp
@@ -9,6 +9,7 @@
 
 #include <errno.h>
 #include <fcntl.h>
+#include <optional>
 #include <unistd.h>
 
 TokenPipeEnd TokenPipe::TakeReadEnd()
diff --git a/src/validation.cpp b/src/validation.cpp
index e48bea4b89..b50edeb6fa 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -23,7 +23,6 @@
 #include <logging/timer.h>
 #include <node/coinstats.h>
 #include <node/ui_interface.h>
-#include <optional>
 #include <policy/policy.h>
 #include <policy/settings.h>
 #include <pow.h>
@@ -50,6 +49,7 @@
 #include <validationinterface.h>
 #include <warnings.h>
 
+#include <optional>
 #include <string>
 
 #include <boost/algorithm/string/replace.hpp>
diff --git a/src/validation.h b/src/validation.h
index 119e4bb544..1d3be63a56 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -17,7 +17,6 @@
 #include <crypto/common.h> // for ReadLE64
 #include <fs.h>
 #include <node/utxo_snapshot.h>
-#include <optional>
 #include <policy/feerate.h>
 #include <protocol.h> // For CMessageHeader::MessageStartChars
 #include <script/script_error.h>
@@ -32,6 +31,7 @@
 #include <atomic>
 #include <map>
 #include <memory>
+#include <optional>
 #include <set>
 #include <stdint.h>
 #include <string>
@@ -205,8 +205,7 @@ struct MempoolAcceptResult {
 
     /** Constructor for failure case */
     explicit MempoolAcceptResult(TxValidationState state)
-        : m_result_type(ResultType::INVALID),
-        m_state(state), m_replaced_transactions(std::nullopt), m_base_fees(std::nullopt) {
+        : m_result_type(ResultType::INVALID), m_state(state) {
             Assume(!state.IsValid()); // Can be invalid or error
         }
 
diff --git a/src/wallet/coincontrol.h b/src/wallet/coincontrol.h
index bf7107d0d5..d25a3fb3fa 100644
--- a/src/wallet/coincontrol.h
+++ b/src/wallet/coincontrol.h
@@ -5,13 +5,14 @@
 #ifndef BITCOIN_WALLET_COINCONTROL_H
 #define BITCOIN_WALLET_COINCONTROL_H
 
-#include <optional>
 #include <outputtype.h>
 #include <policy/feerate.h>
 #include <policy/fees.h>
 #include <primitives/transaction.h>
 #include <script/standard.h>
 
+#include <optional>
+
 const int DEFAULT_MIN_DEPTH = 0;
 const int DEFAULT_MAX_DEPTH = 9999999;
 
diff --git a/src/wallet/coinselection.cpp b/src/wallet/coinselection.cpp
index fe4ef21d28..5a18308a73 100644
--- a/src/wallet/coinselection.cpp
+++ b/src/wallet/coinselection.cpp
@@ -4,11 +4,12 @@
 
 #include <wallet/coinselection.h>
 
-#include <optional>
 #include <policy/feerate.h>
 #include <util/system.h>
 #include <util/moneystr.h>
 
+#include <optional>
+
 // Descending order comparator
 struct {
     bool operator()(const OutputGroup& a, const OutputGroup& b) const
diff --git a/src/wallet/db.h b/src/wallet/db.h
index 2bc50bacfd..7a0d3d2e07 100644
--- a/src/wallet/db.h
+++ b/src/wallet/db.h
@@ -8,12 +8,12 @@
 
 #include <clientversion.h>
 #include <fs.h>
-#include <optional>
 #include <streams.h>
 #include <support/allocators/secure.h>
 
 #include <atomic>
 #include <memory>
+#include <optional>
 #include <string>
 
 struct bilingual_str;
diff --git a/src/wallet/rpcdump.cpp b/src/wallet/rpcdump.cpp
index a6e7956262..0737e68cf3 100644
--- a/src/wallet/rpcdump.cpp
+++ b/src/wallet/rpcdump.cpp
@@ -1788,7 +1788,7 @@ RPCHelpMan listdescriptors()
         const bool active = active_spk_mans.count(desc_spk_man) != 0;
         spk.pushKV("active", active);
         const auto& type = wallet_descriptor.descriptor->GetOutputType();
-        if (active && type != std::nullopt) {
+        if (active && type) {
             spk.pushKV("internal", wallet->GetScriptPubKeyMan(*type, true) == desc_spk_man);
         }
         if (wallet_descriptor.descriptor->IsRange()) {
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index cf71f1e163..f6bae47365 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -8,7 +8,6 @@
 #include <interfaces/chain.h>
 #include <key_io.h>
 #include <node/context.h>
-#include <optional>
 #include <outputtype.h>
 #include <policy/feerate.h>
 #include <policy/fees.h>
@@ -38,6 +37,7 @@
 #include <wallet/walletdb.h>
 #include <wallet/walletutil.h>
 
+#include <optional>
 #include <stdint.h>
 
 #include <univalue.h>
@@ -219,7 +219,7 @@ static void SetFeeEstimateMode(const CWallet& wallet, CCoinControl& cc, const Un
         cc.m_feerate = CFeeRate(AmountFromValue(fee_rate), COIN);
         if (override_min_fee) cc.fOverrideFeeRate = true;
         // Default RBF to true for explicit fee_rate, if unset.
-        if (cc.m_signal_bip125_rbf == std::nullopt) cc.m_signal_bip125_rbf = true;
+        if (!cc.m_signal_bip125_rbf) cc.m_signal_bip125_rbf = true;
         return;
     }
     if (!estimate_mode.isNull() && !FeeModeFromString(estimate_mode.get_str(), cc.m_fee_mode)) {
diff --git a/src/wallet/scriptpubkeyman.cpp b/src/wallet/scriptpubkeyman.cpp
index 2ec1430c83..54319ca662 100644
--- a/src/wallet/scriptpubkeyman.cpp
+++ b/src/wallet/scriptpubkeyman.cpp
@@ -16,6 +16,8 @@
 #include <wallet/external_signer.h>
 #include <wallet/scriptpubkeyman.h>
 
+#include <optional>
+
 //! Value for the first BIP 32 hardened derivation. Can be used as a bit mask and as a value. See BIP 32 for more details.
 const uint32_t BIP32_HARDENED_KEY_LIMIT = 0x80000000;
 
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index ad1d04d084..2b36da2e0e 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -13,7 +13,6 @@
 #include <interfaces/wallet.h>
 #include <key.h>
 #include <key_io.h>
-#include <optional>
 #include <outputtype.h>
 #include <policy/fees.h>
 #include <policy/policy.h>
@@ -40,6 +39,7 @@
 
 #include <algorithm>
 #include <assert.h>
+#include <optional>
 
 #include <boost/algorithm/string/replace.hpp>
 
@@ -87,7 +87,7 @@ static void UpdateWalletSetting(interfaces::Chain& chain,
                                 std::optional<bool> load_on_startup,
                                 std::vector<bilingual_str>& warnings)
 {
-    if (load_on_startup == std::nullopt) return;
+    if (!load_on_startup) return;
     if (load_on_startup.value() && !AddWalletSetting(chain, wallet_name)) {
         warnings.emplace_back(Untranslated("Wallet load on startup setting could not be updated, so wallet may not be loaded next node startup."));
     } else if (!load_on_startup.value() && !RemoveWalletSetting(chain, wallet_name)) {
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index 5087ffb35c..13a856afb0 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -30,6 +30,7 @@
 #include <atomic>
 #include <map>
 #include <memory>
+#include <optional>
 #include <set>
 #include <stdexcept>
 #include <stdint.h>
diff --git a/src/wallet/walletdb.cpp b/src/wallet/walletdb.cpp
index c9bb73bb7c..3d9248009f 100644
--- a/src/wallet/walletdb.cpp
+++ b/src/wallet/walletdb.cpp
@@ -23,6 +23,7 @@
 #include <wallet/wallet.h>
 
 #include <atomic>
+#include <optional>
 #include <string>
 
 namespace DBKeys {