diff --git a/src/addrdb.cpp b/src/addrdb.cpp
index 31f8eadf9..cd124d157 100644
--- a/src/addrdb.cpp
+++ b/src/addrdb.cpp
@@ -92,7 +92,7 @@ void DeserializeDB(Stream& stream, Data& data, bool fCheckSum = true)
     unsigned char pchMsgTmp[4];
     verifier >> pchMsgTmp;
     // ... verify the network matches ours
-    if (memcmp(pchMsgTmp, Params().MessageStart(), sizeof(pchMsgTmp))) {
+    if (std::memcmp(pchMsgTmp, Params().MessageStart(), sizeof(pchMsgTmp))) {
         throw std::runtime_error{"Invalid network magic number"};
     }
 
diff --git a/src/base58.cpp b/src/base58.cpp
index 11c1ce739..de9a82d46 100644
--- a/src/base58.cpp
+++ b/src/base58.cpp
@@ -150,7 +150,7 @@ std::string EncodeBase58Check(Span<const unsigned char> input)
     }
     // re-calculate the checksum, ensure it matches the included 4-byte checksum
     uint256 hash = Hash(Span{vchRet}.first(vchRet.size() - 4));
-    if (memcmp(&hash, &vchRet[vchRet.size() - 4], 4) != 0) {
+    if (std::memcmp(&hash, &vchRet[vchRet.size() - 4], 4) != 0) {
         vchRet.clear();
         return false;
     }
diff --git a/src/net.cpp b/src/net.cpp
index 88f4cef5b..47ccede26 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -732,7 +732,7 @@ int V1TransportDeserializer::readHeader(Span<const uint8_t> msg_bytes)
     }
 
     // Check start string, network magic
-    if (memcmp(hdr.pchMessageStart, m_chain_params.MessageStart(), CMessageHeader::MESSAGE_START_SIZE) != 0) {
+    if (std::memcmp(hdr.pchMessageStart, m_chain_params.MessageStart(), CMessageHeader::MESSAGE_START_SIZE) != 0) {
         LogPrint(BCLog::NET, "Header error: Wrong MessageStart %s received, peer=%d\n", HexStr(hdr.pchMessageStart), m_node_id);
         return -1;
     }
@@ -793,7 +793,7 @@ CNetMessage V1TransportDeserializer::GetMessage(const std::chrono::microseconds
     RandAddEvent(ReadLE32(hash.begin()));
 
     // Check checksum and header message type string
-    if (memcmp(hash.begin(), hdr.pchChecksum, CMessageHeader::CHECKSUM_SIZE) != 0) {
+    if (std::memcmp(hash.begin(), hdr.pchChecksum, CMessageHeader::CHECKSUM_SIZE) != 0) {
         LogPrint(BCLog::NET, "Header error: Wrong checksum (%s, %u bytes), expected %s was %s, peer=%d\n",
                  SanitizeString(msg.m_type), msg.m_message_size,
                  HexStr(Span{hash}.first(CMessageHeader::CHECKSUM_SIZE)),
diff --git a/src/node/blockstorage.cpp b/src/node/blockstorage.cpp
index 17ab226a3..88a90e256 100644
--- a/src/node/blockstorage.cpp
+++ b/src/node/blockstorage.cpp
@@ -768,7 +768,7 @@ bool ReadRawBlockFromDisk(std::vector<uint8_t>& block, const FlatFilePos& pos, c
 
         filein >> blk_start >> blk_size;
 
-        if (memcmp(blk_start, message_start, CMessageHeader::MESSAGE_START_SIZE)) {
+        if (std::memcmp(blk_start, message_start, CMessageHeader::MESSAGE_START_SIZE)) {
             return error("%s: Block magic mismatch for %s: %s versus expected %s", __func__, pos.ToString(),
                          HexStr(blk_start),
                          HexStr(message_start));
diff --git a/src/script/interpreter.cpp b/src/script/interpreter.cpp
index c4d13d728..1cabf65ac 100644
--- a/src/script/interpreter.cpp
+++ b/src/script/interpreter.cpp
@@ -1877,7 +1877,7 @@ static bool VerifyWitnessProgram(const CScriptWitness& witness, int witversion,
             exec_script = CScript(script_bytes.begin(), script_bytes.end());
             uint256 hash_exec_script;
             CSHA256().Write(exec_script.data(), exec_script.size()).Finalize(hash_exec_script.begin());
-            if (memcmp(hash_exec_script.begin(), program.data(), 32)) {
+            if (std::memcmp(hash_exec_script.begin(), program.data(), 32)) {
                 return set_error(serror, SCRIPT_ERR_WITNESS_PROGRAM_MISMATCH);
             }
             return ExecuteWitnessScript(stack, exec_script, flags, SigVersion::WITNESS_V0, checker, execdata, serror);
diff --git a/src/validation.cpp b/src/validation.cpp
index fefbe033e..b3fcba2cd 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -3548,7 +3548,7 @@ static bool ContextualCheckBlock(const CBlock& block, BlockValidationState& stat
                 return state.Invalid(BlockValidationResult::BLOCK_MUTATED, "bad-witness-nonce-size", strprintf("%s : invalid witness reserved value size", __func__));
             }
             CHash256().Write(hashWitness).Write(block.vtx[0]->vin[0].scriptWitness.stack[0]).Finalize(hashWitness);
-            if (memcmp(hashWitness.begin(), &block.vtx[0]->vout[commitpos].scriptPubKey[6], 32)) {
+            if (std::memcmp(hashWitness.begin(), &block.vtx[0]->vout[commitpos].scriptPubKey[6], 32)) {
                 return state.Invalid(BlockValidationResult::BLOCK_MUTATED, "bad-witness-merkle-match", strprintf("%s : witness merkle commitment mismatch", __func__));
             }
             fHaveWitness = true;
@@ -4294,7 +4294,7 @@ void CChainState::LoadExternalBlockFile(FILE* fileIn, FlatFilePos* dbp)
                 blkdat.FindByte(m_params.MessageStart()[0]);
                 nRewind = blkdat.GetPos() + 1;
                 blkdat >> buf;
-                if (memcmp(buf, m_params.MessageStart(), CMessageHeader::MESSAGE_START_SIZE)) {
+                if (std::memcmp(buf, m_params.MessageStart(), CMessageHeader::MESSAGE_START_SIZE)) {
                     continue;
                 }
                 // read size