diff --git a/src/httpserver.cpp b/src/httpserver.cpp
index 2dcb1b240aafb0..040ab388309376 100644
--- a/src/httpserver.cpp
+++ b/src/httpserver.cpp
@@ -45,7 +45,7 @@
 static const size_t MAX_HEADERS_SIZE = 8192;
 
 /** HTTP request work item */
-class HTTPWorkItem : public HTTPClosure
+class HTTPWorkItem final : public HTTPClosure
 {
 public:
     HTTPWorkItem(std::unique_ptr<HTTPRequest> _req, const std::string &_path, const HTTPRequestHandler& _func):
diff --git a/src/init.cpp b/src/init.cpp
index 4f4609f0c415bc..23b7401dfb5e49 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -170,7 +170,7 @@ bool ShutdownRequested()
  * chainstate, while keeping user interface out of the common library, which is shared
  * between bitcoind, and bitcoin-qt and non-server tools.
 */
-class CCoinsViewErrorCatcher : public CCoinsViewBacked
+class CCoinsViewErrorCatcher final : public CCoinsViewBacked
 {
 public:
     CCoinsViewErrorCatcher(CCoinsView* view) : CCoinsViewBacked(view) {}
diff --git a/src/txdb.h b/src/txdb.h
index ff35677b5ef80a..6887f838df3c12 100644
--- a/src/txdb.h
+++ b/src/txdb.h
@@ -65,7 +65,7 @@ struct CDiskTxPos : public CDiskBlockPos
 };
 
 /** CCoinsView backed by the coin database (chainstate/) */
-class CCoinsViewDB : public CCoinsView
+class CCoinsViewDB final : public CCoinsView
 {
 protected:
     CDBWrapper db;
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index 361d336f268aa7..499234a276218c 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -702,7 +702,7 @@ class CAccountingEntry
  * A CWallet is an extension of a keystore, which also maintains a set of transactions and balances,
  * and provides the ability to create new transactions.
  */
-class CWallet : public CCryptoKeyStore, public CValidationInterface
+class CWallet final : public CCryptoKeyStore, public CValidationInterface
 {
 private:
     static std::atomic<bool> fFlushScheduled;
@@ -1260,7 +1260,7 @@ class CWallet : public CCryptoKeyStore, public CValidationInterface
 };
 
 /** A key allocated from the key pool. */
-class CReserveKey : public CReserveScript
+class CReserveKey final : public CReserveScript
 {
 protected:
     CWallet* pwallet;
diff --git a/src/zmq/zmqnotificationinterface.h b/src/zmq/zmqnotificationinterface.h
index 3561e5ca57ee35..c324f47478b3ed 100644
--- a/src/zmq/zmqnotificationinterface.h
+++ b/src/zmq/zmqnotificationinterface.h
@@ -13,7 +13,7 @@
 class CBlockIndex;
 class CZMQAbstractNotifier;
 
-class CZMQNotificationInterface : public CValidationInterface
+class CZMQNotificationInterface final : public CValidationInterface
 {
 public:
     virtual ~CZMQNotificationInterface();