diff --git a/src/bitcoin-tx.cpp b/src/bitcoin-tx.cpp
--- a/src/bitcoin-tx.cpp
+++ b/src/bitcoin-tx.cpp
@@ -18,6 +18,7 @@
 #include <script/signingprovider.h>
 #include <util/moneystr.h>
 #include <util/strencodings.h>
+#include <util/string.h>
 #include <util/system.h>
 #include <util/translation.h>
 
@@ -381,8 +382,8 @@
     if (required < 1 || required > MAX_PUBKEYS_PER_MULTISIG || numkeys < 1 ||
         numkeys > MAX_PUBKEYS_PER_MULTISIG || numkeys < required) {
         throw std::runtime_error("multisig parameter mismatch. Required " +
-                                 std::to_string(required) + " of " +
-                                 std::to_string(numkeys) + "signatures.");
+                                 ToString(required) + " of " +
+                                 ToString(numkeys) + "signatures.");
     }
 
     // extract and validate PUBKEYs
diff --git a/src/qt/optionsmodel.cpp b/src/qt/optionsmodel.cpp
--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -15,7 +15,8 @@
 #include <qt/guiconstants.h>
 #include <qt/guiutil.h>
 #include <qt/intro.h>
-#include <txdb.h>       // for -dbcache defaults
+#include <txdb.h> // for -dbcache defaults
+#include <util/string.h>
 #include <validation.h> // For DEFAULT_SCRIPTCHECK_THREADS
 
 #include <QNetworkProxy>
@@ -288,7 +289,7 @@
     // Convert prune size from GB to MiB:
     const uint64_t nPruneSizeMiB =
         (settings.value("nPruneSize").toInt() * GB_BYTES) >> 20;
-    std::string prune_val = prune ? std::to_string(nPruneSizeMiB) : "0";
+    std::string prune_val = prune ? ToString(nPruneSizeMiB) : "0";
     if (force) {
         gArgs.ForceSetArg("-prune", prune_val);
         return;
diff --git a/src/rpc/net.cpp b/src/rpc/net.cpp
--- a/src/rpc/net.cpp
+++ b/src/rpc/net.cpp
@@ -22,6 +22,7 @@
 #include <sync.h>
 #include <timedata.h>
 #include <util/strencodings.h>
+#include <util/string.h>
 #include <util/system.h>
 #include <validation.h>
 #include <version.h>
@@ -911,8 +912,8 @@
         {
             {"count", RPCArg::Type::NUM, /* default */ "1",
              "How many addresses to return. Limited to the smaller of " +
-                 std::to_string(ADDRMAN_GETADDR_MAX) + " or " +
-                 std::to_string(ADDRMAN_GETADDR_MAX_PCT) +
+                 ToString(ADDRMAN_GETADDR_MAX) + " or " +
+                 ToString(ADDRMAN_GETADDR_MAX_PCT) +
                  "% of all known addresses."},
         },
         RPCResult{
diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp
--- a/src/rpc/rawtransaction.cpp
+++ b/src/rpc/rawtransaction.cpp
@@ -35,6 +35,7 @@
 #include <util/error.h>
 #include <util/moneystr.h>
 #include <util/strencodings.h>
+#include <util/string.h>
 #include <validation.h>
 #include <validationinterface.h>
 
@@ -1164,7 +1165,7 @@
             num &= ~0x80000000;
         }
 
-        keypath_str += std::to_string(num);
+        keypath_str += ToString(num);
         if (hardened) {
             keypath_str += "'";
         }
diff --git a/src/rpc/util.cpp b/src/rpc/util.cpp
--- a/src/rpc/util.cpp
+++ b/src/rpc/util.cpp
@@ -519,7 +519,7 @@
         }
 
         // Push named argument name and description
-        sections.m_sections.emplace_back(std::to_string(i + 1) + ". " +
+        sections.m_sections.emplace_back(::ToString(i + 1) + ". " +
                                              arg.GetFirstName(),
                                          arg.ToDescriptionString());
         sections.m_max_pad = std::max(sections.m_max_pad,
diff --git a/src/test/addrman_tests.cpp b/src/test/addrman_tests.cpp
--- a/src/test/addrman_tests.cpp
+++ b/src/test/addrman_tests.cpp
@@ -7,6 +7,7 @@
 #include <netbase.h>
 #include <random.h>
 #include <util/asmap.h>
+#include <util/string.h>
 
 #include <test/data/asmap.raw.h>
 #include <test/util/setup_common.h>
@@ -259,7 +260,7 @@
     BOOST_CHECK_EQUAL(addrman.size(), 0U);
 
     for (unsigned int i = 1; i < 18; i++) {
-        CService addr = ResolveService("250.1.1." + std::to_string(i));
+        CService addr = ResolveService("250.1.1." + ToString(i));
         BOOST_CHECK(addrman.Add(CAddress(addr, NODE_NONE), source));
 
         // Test: No collision in new table yet.
@@ -284,7 +285,7 @@
     BOOST_CHECK_EQUAL(addrman.size(), 0U);
 
     for (unsigned int i = 1; i < 80; i++) {
-        CService addr = ResolveService("250.1.1." + std::to_string(i));
+        CService addr = ResolveService("250.1.1." + ToString(i));
         BOOST_CHECK(addrman.Add(CAddress(addr, NODE_NONE), source));
         addrman.Good(CAddress(addr, NODE_NONE));
 
@@ -413,7 +414,7 @@
         int octet1 = i % 256;
         int octet2 = i >> 8 % 256;
         std::string strAddr =
-            std::to_string(octet1) + "." + std::to_string(octet2) + ".1.23";
+            ToString(octet1) + "." + ToString(octet2) + ".1.23";
         CAddress addr = CAddress(ResolveService(strAddr), NODE_NONE);
 
         // Ensure that for all addrs in addrman, isTerrible == false.
@@ -466,8 +467,8 @@
     std::set<int> buckets;
     for (int i = 0; i < 255; i++) {
         CAddrInfo infoi = CAddrInfo(
-            CAddress(ResolveService("250.1.1." + std::to_string(i)), NODE_NONE),
-            ResolveIP("250.1.1." + std::to_string(i)));
+            CAddress(ResolveService("250.1.1." + ToString(i)), NODE_NONE),
+            ResolveIP("250.1.1." + ToString(i)));
         int bucket = infoi.GetTriedBucket(nKey1, asmap);
         buckets.insert(bucket);
     }
@@ -478,9 +479,8 @@
     buckets.clear();
     for (int j = 0; j < 255; j++) {
         CAddrInfo infoj = CAddrInfo(
-            CAddress(ResolveService("250." + std::to_string(j) + ".1.1"),
-                     NODE_NONE),
-            ResolveIP("250." + std::to_string(j) + ".1.1"));
+            CAddress(ResolveService("250." + ToString(j) + ".1.1"), NODE_NONE),
+            ResolveIP("250." + ToString(j) + ".1.1"));
         int bucket = infoj.GetTriedBucket(nKey1, asmap);
         buckets.insert(bucket);
     }
@@ -523,8 +523,8 @@
     std::set<int> buckets;
     for (int i = 0; i < 255; i++) {
         CAddrInfo infoi = CAddrInfo(
-            CAddress(ResolveService("250.1.1." + std::to_string(i)), NODE_NONE),
-            ResolveIP("250.1.1." + std::to_string(i)));
+            CAddress(ResolveService("250.1.1." + ToString(i)), NODE_NONE),
+            ResolveIP("250.1.1." + ToString(i)));
         int bucket = infoi.GetNewBucket(nKey1, asmap);
         buckets.insert(bucket);
     }
@@ -534,11 +534,11 @@
 
     buckets.clear();
     for (int j = 0; j < 4 * 255; j++) {
-        CAddrInfo infoj = CAddrInfo(
-            CAddress(ResolveService(std::to_string(250 + (j / 255)) + "." +
-                                    std::to_string(j % 256) + ".1.1"),
-                     NODE_NONE),
-            ResolveIP("251.4.1.1"));
+        CAddrInfo infoj =
+            CAddrInfo(CAddress(ResolveService(ToString(250 + (j / 255)) + "." +
+                                              ToString(j % 256) + ".1.1"),
+                               NODE_NONE),
+                      ResolveIP("251.4.1.1"));
         int bucket = infoj.GetNewBucket(nKey1, asmap);
         buckets.insert(bucket);
     }
@@ -550,7 +550,7 @@
     for (int p = 0; p < 255; p++) {
         CAddrInfo infoj =
             CAddrInfo(CAddress(ResolveService("250.1.1.1"), NODE_NONE),
-                      ResolveIP("250." + std::to_string(p) + ".1.1"));
+                      ResolveIP("250." + ToString(p) + ".1.1"));
         int bucket = infoj.GetNewBucket(nKey1, asmap);
         buckets.insert(bucket);
     }
@@ -603,9 +603,8 @@
     std::set<int> buckets;
     for (int j = 0; j < 255; j++) {
         CAddrInfo infoj = CAddrInfo(
-            CAddress(ResolveService("101." + std::to_string(j) + ".1.1"),
-                     NODE_NONE),
-            ResolveIP("101." + std::to_string(j) + ".1.1"));
+            CAddress(ResolveService("101." + ToString(j) + ".1.1"), NODE_NONE),
+            ResolveIP("101." + ToString(j) + ".1.1"));
         int bucket = infoj.GetTriedBucket(nKey1, asmap);
         buckets.insert(bucket);
     }
@@ -616,9 +615,8 @@
     buckets.clear();
     for (int j = 0; j < 255; j++) {
         CAddrInfo infoj = CAddrInfo(
-            CAddress(ResolveService("250." + std::to_string(j) + ".1.1"),
-                     NODE_NONE),
-            ResolveIP("250." + std::to_string(j) + ".1.1"));
+            CAddress(ResolveService("250." + ToString(j) + ".1.1"), NODE_NONE),
+            ResolveIP("250." + ToString(j) + ".1.1"));
         int bucket = infoj.GetTriedBucket(nKey1, asmap);
         buckets.insert(bucket);
     }
@@ -660,8 +658,8 @@
     std::set<int> buckets;
     for (int i = 0; i < 255; i++) {
         CAddrInfo infoi = CAddrInfo(
-            CAddress(ResolveService("250.1.1." + std::to_string(i)), NODE_NONE),
-            ResolveIP("250.1.1." + std::to_string(i)));
+            CAddress(ResolveService("250.1.1." + ToString(i)), NODE_NONE),
+            ResolveIP("250.1.1." + ToString(i)));
         int bucket = infoi.GetNewBucket(nKey1, asmap);
         buckets.insert(bucket);
     }
@@ -671,11 +669,11 @@
 
     buckets.clear();
     for (int j = 0; j < 4 * 255; j++) {
-        CAddrInfo infoj = CAddrInfo(
-            CAddress(ResolveService(std::to_string(250 + (j / 255)) + "." +
-                                    std::to_string(j % 256) + ".1.1"),
-                     NODE_NONE),
-            ResolveIP("251.4.1.1"));
+        CAddrInfo infoj =
+            CAddrInfo(CAddress(ResolveService(ToString(250 + (j / 255)) + "." +
+                                              ToString(j % 256) + ".1.1"),
+                               NODE_NONE),
+                      ResolveIP("251.4.1.1"));
         int bucket = infoj.GetNewBucket(nKey1, asmap);
         buckets.insert(bucket);
     }
@@ -687,7 +685,7 @@
     for (int p = 0; p < 255; p++) {
         CAddrInfo infoj =
             CAddrInfo(CAddress(ResolveService("250.1.1.1"), NODE_NONE),
-                      ResolveIP("101." + std::to_string(p) + ".1.1"));
+                      ResolveIP("101." + ToString(p) + ".1.1"));
         int bucket = infoj.GetNewBucket(nKey1, asmap);
         buckets.insert(bucket);
     }
@@ -699,7 +697,7 @@
     for (int p = 0; p < 255; p++) {
         CAddrInfo infoj =
             CAddrInfo(CAddress(ResolveService("250.1.1.1"), NODE_NONE),
-                      ResolveIP("250." + std::to_string(p) + ".1.1"));
+                      ResolveIP("250." + ToString(p) + ".1.1"));
         int bucket = infoj.GetNewBucket(nKey1, asmap);
         buckets.insert(bucket);
     }
@@ -799,7 +797,7 @@
     // Add twenty two addresses.
     CNetAddr source = ResolveIP("252.2.2.2");
     for (unsigned int i = 1; i < 23; i++) {
-        CService addr = ResolveService("250.1.1." + std::to_string(i));
+        CService addr = ResolveService("250.1.1." + ToString(i));
         BOOST_CHECK(addrman.Add(CAddress(addr, NODE_NONE), source));
         addrman.Good(addr);
 
@@ -810,7 +808,7 @@
 
     // Ensure Good handles duplicates well.
     for (unsigned int i = 1; i < 23; i++) {
-        CService addr = ResolveService("250.1.1." + std::to_string(i));
+        CService addr = ResolveService("250.1.1." + ToString(i));
         addrman.Good(addr);
 
         BOOST_CHECK(addrman.size() == 22);
@@ -824,7 +822,7 @@
     // Add twenty two addresses.
     CNetAddr source = ResolveIP("252.2.2.2");
     for (unsigned int i = 1; i < 23; i++) {
-        CService addr = ResolveService("250.1.1." + std::to_string(i));
+        CService addr = ResolveService("250.1.1." + ToString(i));
         BOOST_CHECK(addrman.Add(CAddress(addr, NODE_NONE), source));
         addrman.Good(addr);
 
@@ -847,7 +845,7 @@
 
     // Lets create two collisions.
     for (unsigned int i = 24; i < 33; i++) {
-        CService addr = ResolveService("250.1.1." + std::to_string(i));
+        CService addr = ResolveService("250.1.1." + ToString(i));
         BOOST_CHECK(addrman.Add(CAddress(addr, NODE_NONE), source));
         addrman.Good(addr);
 
@@ -884,7 +882,7 @@
     // Add twenty two addresses.
     CNetAddr source = ResolveIP("252.2.2.2");
     for (unsigned int i = 1; i < 23; i++) {
-        CService addr = ResolveService("250.1.1." + std::to_string(i));
+        CService addr = ResolveService("250.1.1." + ToString(i));
         BOOST_CHECK(addrman.Add(CAddress(addr, NODE_NONE), source));
         addrman.Good(addr);
 
diff --git a/src/test/blockchain_tests.cpp b/src/test/blockchain_tests.cpp
--- a/src/test/blockchain_tests.cpp
+++ b/src/test/blockchain_tests.cpp
@@ -1,6 +1,7 @@
 #include <rpc/blockchain.h>
 
 #include <chain.h>
+#include <util/string.h>
 
 #include <test/util/setup_common.h>
 
@@ -27,9 +28,9 @@
 static void RejectDifficultyMismatch(double difficulty,
                                      double expected_difficulty) {
     BOOST_CHECK_MESSAGE(DoubleEquals(difficulty, expected_difficulty, 0.00001),
-                        "Difficulty was " + std::to_string(difficulty) +
+                        "Difficulty was " + ToString(difficulty) +
                             " but was expected to be " +
-                            std::to_string(expected_difficulty));
+                            ToString(expected_difficulty));
 }
 
 /**
diff --git a/src/test/key_tests.cpp b/src/test/key_tests.cpp
--- a/src/test/key_tests.cpp
+++ b/src/test/key_tests.cpp
@@ -8,6 +8,7 @@
 #include <key_io.h>
 #include <uint256.h>
 #include <util/strencodings.h>
+#include <util/string.h>
 #include <util/system.h>
 
 #include <test/util/setup_common.h>
@@ -361,7 +362,7 @@
     bool found_small = false;
     for (int i = 0; i < 256; ++i) {
         sig.clear();
-        msg = "A message to be signed" + std::to_string(i);
+        msg = "A message to be signed" + ToString(i);
         msg_hash = Hash(msg.begin(), msg.end());
         BOOST_CHECK(key.SignECDSA(msg_hash, sig));
         found = sig[3] == 0x20;
diff --git a/src/test/net_tests.cpp b/src/test/net_tests.cpp
--- a/src/test/net_tests.cpp
+++ b/src/test/net_tests.cpp
@@ -12,6 +12,7 @@
 #include <netbase.h>
 #include <serialize.h>
 #include <streams.h>
+#include <util/string.h>
 
 #include <test/util/setup_common.h>
 
@@ -90,7 +91,7 @@
     BOOST_CHECK(port == Params().GetDefaultPort());
     // test set port
     unsigned short altPort = 12345;
-    BOOST_CHECK(gArgs.SoftSetArg("-port", std::to_string(altPort)));
+    BOOST_CHECK(gArgs.SoftSetArg("-port", ToString(altPort)));
     port = GetListenPort();
     BOOST_CHECK(port == altPort);
 }
@@ -215,9 +216,9 @@
     gArgs.ForceSetMultiArg("-uacomment", {uacomment});
 
     const std::string versionMessage =
-        "/Bitcoin ABC:" + std::to_string(CLIENT_VERSION_MAJOR) + "." +
-        std::to_string(CLIENT_VERSION_MINOR) + "." +
-        std::to_string(CLIENT_VERSION_REVISION) + "(EB8.0; " + uacomment + ")/";
+        "/Bitcoin ABC:" + ToString(CLIENT_VERSION_MAJOR) + "." +
+        ToString(CLIENT_VERSION_MINOR) + "." +
+        ToString(CLIENT_VERSION_REVISION) + "(EB8.0; " + uacomment + ")/";
 
     BOOST_CHECK_EQUAL(userAgent(config), versionMessage);
 }
diff --git a/src/test/settings_tests.cpp b/src/test/settings_tests.cpp
--- a/src/test/settings_tests.cpp
+++ b/src/test/settings_tests.cpp
@@ -7,6 +7,7 @@
 #include <test/util/setup_common.h>
 #include <test/util/str.h>
 #include <util/strencodings.h>
+#include <util/string.h>
 #include <util/system.h>
 
 #include <univalue.h>
@@ -212,8 +213,7 @@
                                std::vector<util::SettingsValue> &dest) {
             if (action == SET || action == SECTION_SET) {
                 for (int i = 0; i < 2; ++i) {
-                    dest.push_back(value_prefix +
-                                   std::to_string(++value_suffix));
+                    dest.push_back(value_prefix + ToString(++value_suffix));
                     desc +=
                         " " + name_prefix + name + "=" + dest.back().get_str();
                 }
diff --git a/src/test/timedata_tests.cpp b/src/test/timedata_tests.cpp
--- a/src/test/timedata_tests.cpp
+++ b/src/test/timedata_tests.cpp
@@ -7,6 +7,7 @@
 #include <netaddress.h>
 #include <noui.h>
 #include <test/util/logging.h>
+#include <util/string.h>
 #include <warnings.h>
 
 #include <test/util/setup_common.h>
@@ -45,7 +46,7 @@
     static int cnt = 0;
     for (int i = 0; i < n; ++i) {
         CNetAddr addr;
-        addr.SetInternal(std::to_string(++cnt));
+        addr.SetInternal(ToString(++cnt));
         AddTimeData(addr, offset);
     }
 }
diff --git a/src/test/util/setup_common.h b/src/test/util/setup_common.h
--- a/src/test/util/setup_common.h
+++ b/src/test/util/setup_common.h
@@ -15,6 +15,7 @@
 #include <random.h>
 #include <scheduler.h>
 #include <util/check.h>
+#include <util/string.h>
 #include <util/system.h>
 
 #include <boost/thread.hpp> // For boost::thread_group
diff --git a/src/test/util/setup_common.cpp b/src/test/util/setup_common.cpp
--- a/src/test/util/setup_common.cpp
+++ b/src/test/util/setup_common.cpp
@@ -28,6 +28,7 @@
 #include <txdb.h>
 #include <txmempool.h>
 #include <util/strencodings.h>
+#include <util/string.h>
 #include <util/time.h>
 #include <util/translation.h>
 #include <util/vector.h>
diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
--- a/src/test/util_tests.cpp
+++ b/src/test/util_tests.cpp
@@ -1066,7 +1066,7 @@
             if (action == SET || action == SECTION_SET) {
                 for (int i = 0; i < 2; ++i) {
                     values.push_back(prefix + name + "=" + value_prefix +
-                                     std::to_string(++suffix));
+                                     ToString(++suffix));
                 }
             }
             if (action == NEGATE || action == SECTION_NEGATE) {
diff --git a/src/test/util_threadnames_tests.cpp b/src/test/util_threadnames_tests.cpp
--- a/src/test/util_threadnames_tests.cpp
+++ b/src/test/util_threadnames_tests.cpp
@@ -2,6 +2,7 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include <util/string.h>
 #include <util/threadnames.h>
 
 #if defined(HAVE_CONFIG_H)
@@ -32,7 +33,7 @@
     std::mutex lock;
 
     auto RenameThisThread = [&](int i) {
-        util::ThreadRename(TEST_THREAD_NAME_BASE + std::to_string(i));
+        util::ThreadRename(TEST_THREAD_NAME_BASE + ToString(i));
         std::lock_guard<std::mutex> guard(lock);
         names.insert(util::ThreadGetInternalName());
     };
@@ -61,7 +62,7 @@
 
     // Names "test_thread.[n]" should exist for n = [0, 99]
     for (int i = 0; i < 100; ++i) {
-        BOOST_CHECK(names.find(TEST_THREAD_NAME_BASE + std::to_string(i)) !=
+        BOOST_CHECK(names.find(TEST_THREAD_NAME_BASE + ToString(i)) !=
                     names.end());
     }
 }
diff --git a/src/util/string.h b/src/util/string.h
--- a/src/util/string.h
+++ b/src/util/string.h
@@ -8,6 +8,8 @@
 #include <attributes.h>
 
 #include <cstring>
+#include <locale>
+#include <sstream>
 #include <string>
 #include <vector>
 
@@ -59,4 +61,14 @@
     return str.size() == strlen(str.c_str());
 }
 
+/**
+ * Locale-independent version of std::to_string
+ */
+template <typename T> std::string ToString(const T &t) {
+    std::ostringstream oss;
+    oss.imbue(std::locale::classic());
+    oss << t;
+    return oss.str();
+}
+
 #endif // BITCOIN_UTIL_STRING_H
diff --git a/src/wallet/scriptpubkeyman.cpp b/src/wallet/scriptpubkeyman.cpp
--- a/src/wallet/scriptpubkeyman.cpp
+++ b/src/wallet/scriptpubkeyman.cpp
@@ -10,6 +10,7 @@
 #include <script/sign.h>
 #include <util/bip32.h>
 #include <util/strencodings.h>
+#include <util/string.h>
 #include <util/translation.h>
 #include <wallet/scriptpubkeyman.h>
 
@@ -963,9 +964,8 @@
         if (internal) {
             chainChildKey.Derive(childKey, hdChain.nInternalChainCounter |
                                                BIP32_HARDENED_KEY_LIMIT);
-            metadata.hdKeypath = "m/0'/1'/" +
-                                 std::to_string(hdChain.nInternalChainCounter) +
-                                 "'";
+            metadata.hdKeypath =
+                "m/0'/1'/" + ToString(hdChain.nInternalChainCounter) + "'";
             metadata.key_origin.path.push_back(0 | BIP32_HARDENED_KEY_LIMIT);
             metadata.key_origin.path.push_back(1 | BIP32_HARDENED_KEY_LIMIT);
             metadata.key_origin.path.push_back(hdChain.nInternalChainCounter |
@@ -974,9 +974,8 @@
         } else {
             chainChildKey.Derive(childKey, hdChain.nExternalChainCounter |
                                                BIP32_HARDENED_KEY_LIMIT);
-            metadata.hdKeypath = "m/0'/0'/" +
-                                 std::to_string(hdChain.nExternalChainCounter) +
-                                 "'";
+            metadata.hdKeypath =
+                "m/0'/0'/" + ToString(hdChain.nExternalChainCounter) + "'";
             metadata.key_origin.path.push_back(0 | BIP32_HARDENED_KEY_LIMIT);
             metadata.key_origin.path.push_back(0 | BIP32_HARDENED_KEY_LIMIT);
             metadata.key_origin.path.push_back(hdChain.nExternalChainCounter |