diff --git a/fairmq/nanomsg/FairMQTransportFactoryNN.h b/fairmq/nanomsg/FairMQTransportFactoryNN.h
index 63aa16b1..7710d07c 100644
--- a/fairmq/nanomsg/FairMQTransportFactoryNN.h
+++ b/fairmq/nanomsg/FairMQTransportFactoryNN.h
@@ -28,24 +28,24 @@ class FairMQTransportFactoryNN : public FairMQTransportFactory
   public:
     FairMQTransportFactoryNN();
 
-    virtual void Initialize(const FairMQProgOptions* config);
+    void Initialize(const FairMQProgOptions* config) override;
 
-    virtual FairMQMessagePtr CreateMessage() const;
-    virtual FairMQMessagePtr CreateMessage(const size_t size) const;
-    virtual FairMQMessagePtr CreateMessage(void* data, const size_t size, fairmq_free_fn* ffn, void* hint = nullptr) const;
+    FairMQMessagePtr CreateMessage() const override;
+    FairMQMessagePtr CreateMessage(const size_t size) const override;
+    FairMQMessagePtr CreateMessage(void* data, const size_t size, fairmq_free_fn* ffn, void* hint = nullptr) const override;
 
     virtual FairMQSocketPtr CreateSocket(const std::string& type, const std::string& name, const std::string& id = "") const;
 
-    virtual FairMQPollerPtr CreatePoller(const std::vector<FairMQChannel>& channels) const;
-    virtual FairMQPollerPtr CreatePoller(const std::unordered_map<std::string, std::vector<FairMQChannel>>& channelsMap, const std::vector<std::string>& channelList) const;
-    virtual FairMQPollerPtr CreatePoller(const FairMQSocket& cmdSocket, const FairMQSocket& dataSocket) const;
+    FairMQPollerPtr CreatePoller(const std::vector<FairMQChannel>& channels) const override;
+    FairMQPollerPtr CreatePoller(const std::unordered_map<std::string, std::vector<FairMQChannel>>& channelsMap, const std::vector<std::string>& channelList) const override;
+    FairMQPollerPtr CreatePoller(const FairMQSocket& cmdSocket, const FairMQSocket& dataSocket) const override;
 
-    virtual FairMQ::Transport GetType() const;
+    FairMQ::Transport GetType() const override;
 
-    virtual void Shutdown();
-    virtual void Terminate();
+    void Shutdown() override;
+    void Terminate() override;
 
-    virtual ~FairMQTransportFactoryNN() {};
+    ~FairMQTransportFactoryNN() override {};
 
   private:
     static FairMQ::Transport fTransportType;
diff --git a/fairmq/shmem/FairMQTransportFactorySHM.h b/fairmq/shmem/FairMQTransportFactorySHM.h
index 45321f5d..8b4fcce6 100644
--- a/fairmq/shmem/FairMQTransportFactorySHM.h
+++ b/fairmq/shmem/FairMQTransportFactorySHM.h
@@ -21,24 +21,24 @@ class FairMQTransportFactorySHM : public FairMQTransportFactory
   public:
     FairMQTransportFactorySHM();
 
-    virtual void Initialize(const FairMQProgOptions* config);
+    void Initialize(const FairMQProgOptions* config) override;
 
-    virtual FairMQMessagePtr CreateMessage() const;
-    virtual FairMQMessagePtr CreateMessage(const size_t size) const;
-    virtual FairMQMessagePtr CreateMessage(void* data, const size_t size, fairmq_free_fn* ffn, void* hint = nullptr) const;
+    FairMQMessagePtr CreateMessage() const override;
+    FairMQMessagePtr CreateMessage(const size_t size) const override;
+    FairMQMessagePtr CreateMessage(void* data, const size_t size, fairmq_free_fn* ffn, void* hint = nullptr) const override;
 
     virtual FairMQSocketPtr CreateSocket(const std::string& type, const std::string& name, const std::string& id = "") const;
 
-    virtual FairMQPollerPtr CreatePoller(const std::vector<FairMQChannel>& channels) const;
-    virtual FairMQPollerPtr CreatePoller(const std::unordered_map<std::string, std::vector<FairMQChannel>>& channelsMap, const std::vector<std::string>& channelList) const;
-    virtual FairMQPollerPtr CreatePoller(const FairMQSocket& cmdSocket, const FairMQSocket& dataSocket) const;
+    FairMQPollerPtr CreatePoller(const std::vector<FairMQChannel>& channels) const override;
+    FairMQPollerPtr CreatePoller(const std::unordered_map<std::string, std::vector<FairMQChannel>>& channelsMap, const std::vector<std::string>& channelList) const override;
+    FairMQPollerPtr CreatePoller(const FairMQSocket& cmdSocket, const FairMQSocket& dataSocket) const override;
 
-    virtual FairMQ::Transport GetType() const;
+    FairMQ::Transport GetType() const override;
 
-    virtual void Shutdown();
-    virtual void Terminate();
+    void Shutdown() override;
+    void Terminate() override;
 
-    virtual ~FairMQTransportFactorySHM() {};
+    ~FairMQTransportFactorySHM() override {};
 
   private:
     static FairMQ::Transport fTransportType;
diff --git a/fairmq/zeromq/FairMQTransportFactoryZMQ.h b/fairmq/zeromq/FairMQTransportFactoryZMQ.h
index 1be6f8a6..a56179f1 100644
--- a/fairmq/zeromq/FairMQTransportFactoryZMQ.h
+++ b/fairmq/zeromq/FairMQTransportFactoryZMQ.h
@@ -28,24 +28,24 @@ class FairMQTransportFactoryZMQ : public FairMQTransportFactory
   public:
     FairMQTransportFactoryZMQ();
 
-    virtual void Initialize(const FairMQProgOptions* config);
+    void Initialize(const FairMQProgOptions* config) override;
 
-    virtual FairMQMessagePtr CreateMessage() const;
-    virtual FairMQMessagePtr CreateMessage(const size_t size) const;
-    virtual FairMQMessagePtr CreateMessage(void* data, const size_t size, fairmq_free_fn* ffn, void* hint = nullptr) const;
+    FairMQMessagePtr CreateMessage() const override;
+    FairMQMessagePtr CreateMessage(const size_t size) const override;
+    FairMQMessagePtr CreateMessage(void* data, const size_t size, fairmq_free_fn* ffn, void* hint = nullptr) const override;
 
     virtual FairMQSocketPtr CreateSocket(const std::string& type, const std::string& name, const std::string& id = "") const;
 
-    virtual FairMQPollerPtr CreatePoller(const std::vector<FairMQChannel>& channels) const;
-    virtual FairMQPollerPtr CreatePoller(const std::unordered_map<std::string, std::vector<FairMQChannel>>& channelsMap, const std::vector<std::string>& channelList) const;
-    virtual FairMQPollerPtr CreatePoller(const FairMQSocket& cmdSocket, const FairMQSocket& dataSocket) const;
+    FairMQPollerPtr CreatePoller(const std::vector<FairMQChannel>& channels) const override;
+    FairMQPollerPtr CreatePoller(const std::unordered_map<std::string, std::vector<FairMQChannel>>& channelsMap, const std::vector<std::string>& channelList) const override;
+    FairMQPollerPtr CreatePoller(const FairMQSocket& cmdSocket, const FairMQSocket& dataSocket) const override;
 
-    virtual FairMQ::Transport GetType() const;
+    FairMQ::Transport GetType() const override;
 
-    virtual void Shutdown();
-    virtual void Terminate();
+    void Shutdown() override;
+    void Terminate() override;
 
-    virtual ~FairMQTransportFactoryZMQ() {};
+    ~FairMQTransportFactoryZMQ() override {};
 
   private:
     static FairMQ::Transport fTransportType;