diff --git a/src/conference/conference.h b/src/conference/conference.h
index 7d5a0af36..583a770c2 100644
--- a/src/conference/conference.h
+++ b/src/conference/conference.h
@@ -47,30 +47,30 @@ public:
 
 public:
 	/* ConferenceInterface */
-	virtual std::shared_ptr<Participant> addParticipant (const Address &addr, const CallSessionParams *params, bool hasMedia) override;
-	virtual void addParticipants (const std::list<Address> &addresses, const CallSessionParams *params, bool hasMedia) override;
-	virtual bool canHandleParticipants () const override;
-	virtual const std::string& getId () const override;
-	virtual int getNbParticipants () const override;
-	virtual std::list<std::shared_ptr<Participant>> getParticipants () const override;
-	virtual void removeParticipant (const std::shared_ptr<const Participant> &participant) override;
-	virtual void removeParticipants (const std::list<std::shared_ptr<Participant>> &participants) override;
+	std::shared_ptr<Participant> addParticipant (const Address &addr, const CallSessionParams *params, bool hasMedia) override;
+	void addParticipants (const std::list<Address> &addresses, const CallSessionParams *params, bool hasMedia) override;
+	bool canHandleParticipants () const override;
+	const std::string& getId () const override;
+	int getNbParticipants () const override;
+	std::list<std::shared_ptr<Participant>> getParticipants () const override;
+	void removeParticipant (const std::shared_ptr<const Participant> &participant) override;
+	void removeParticipants (const std::list<std::shared_ptr<Participant>> &participants) override;
 
 private:
 	/* CallSessionListener */
-	virtual void onAckBeingSent (const CallSession &session, LinphoneHeaders *headers) override;
-	virtual void onAckReceived (const CallSession &session, LinphoneHeaders *headers) override;
-	virtual void onCallSessionAccepted (const CallSession &session) override;
-	virtual void onCallSessionSetReleased (const CallSession &session) override;
-	virtual void onCallSessionSetTerminated (const CallSession &session) override;
-	virtual void onCallSessionStateChanged (const CallSession &session, LinphoneCallState state, const std::string &message) override;
-	virtual void onIncomingCallSessionStarted (const CallSession &session) override;
-	virtual void onEncryptionChanged (const CallSession &session, bool activated, const std::string &authToken) override;
-	virtual void onStatsUpdated (const LinphoneCallStats *stats) override;
-	virtual void onResetCurrentSession (const CallSession &session) override;
-	virtual void onSetCurrentSession (const CallSession &session) override;
-	virtual void onFirstVideoFrameDecoded (const CallSession &session) override;
-	virtual void onResetFirstVideoFrameDecoded (const CallSession &session) override;
+	void onAckBeingSent (const CallSession &session, LinphoneHeaders *headers) override;
+	void onAckReceived (const CallSession &session, LinphoneHeaders *headers) override;
+	void onCallSessionAccepted (const CallSession &session) override;
+	void onCallSessionSetReleased (const CallSession &session) override;
+	void onCallSessionSetTerminated (const CallSession &session) override;
+	void onCallSessionStateChanged (const CallSession &session, LinphoneCallState state, const std::string &message) override;
+	void onIncomingCallSessionStarted (const CallSession &session) override;
+	void onEncryptionChanged (const CallSession &session, bool activated, const std::string &authToken) override;
+	void onStatsUpdated (const LinphoneCallStats *stats) override;
+	void onResetCurrentSession (const CallSession &session) override;
+	void onSetCurrentSession (const CallSession &session) override;
+	void onFirstVideoFrameDecoded (const CallSession &session) override;
+	void onResetFirstVideoFrameDecoded (const CallSession &session) override;
 
 protected:
 	explicit Conference (LinphoneCore *core, const Address &myAddress, CallListener *listener = nullptr);
diff --git a/src/conference/local-conference.h b/src/conference/local-conference.h
index 660081516..30e64229b 100644
--- a/src/conference/local-conference.h
+++ b/src/conference/local-conference.h
@@ -35,14 +35,14 @@ public:
 
 public:
 	/* ConferenceInterface */
-	virtual std::shared_ptr<Participant> addParticipant (const Address &addr, const CallSessionParams *params, bool hasMedia) override;
-	virtual void addParticipants (const std::list<Address> &addresses, const CallSessionParams *params, bool hasMedia) override;
-	virtual bool canHandleParticipants () const override;
-	virtual const std::string& getId () const override;
-	virtual int getNbParticipants () const override;
-	virtual std::list<std::shared_ptr<Participant>> getParticipants () const override;
-	virtual void removeParticipant (const std::shared_ptr<const Participant> &participant) override;
-	virtual void removeParticipants (const std::list<std::shared_ptr<Participant>> &participants) override;
+	std::shared_ptr<Participant> addParticipant (const Address &addr, const CallSessionParams *params, bool hasMedia) override;
+	void addParticipants (const std::list<Address> &addresses, const CallSessionParams *params, bool hasMedia) override;
+	bool canHandleParticipants () const override;
+	const std::string& getId () const override;
+	int getNbParticipants () const override;
+	std::list<std::shared_ptr<Participant>> getParticipants () const override;
+	void removeParticipant (const std::shared_ptr<const Participant> &participant) override;
+	void removeParticipants (const std::list<std::shared_ptr<Participant>> &participants) override;
 
 private:
 	L_DISABLE_COPY(LocalConference);
diff --git a/src/conference/remote-conference.h b/src/conference/remote-conference.h
index c49f44c0b..ddafca6f1 100644
--- a/src/conference/remote-conference.h
+++ b/src/conference/remote-conference.h
@@ -36,16 +36,16 @@ protected:
 
 public:
 	/* ConferenceInterface */
-	virtual std::shared_ptr<Participant> addParticipant (const Address &addr, const CallSessionParams *params, bool hasMedia) override;
-	virtual void removeParticipant (const std::shared_ptr<const Participant> &participant) override;
+	std::shared_ptr<Participant> addParticipant (const Address &addr, const CallSessionParams *params, bool hasMedia) override;
+	void removeParticipant (const std::shared_ptr<const Participant> &participant) override;
 
 protected:
 	/* ConferenceListener */
-	virtual void onConferenceCreated (const Address &addr) override;
-	virtual void onConferenceTerminated (const Address &addr) override;
-	virtual void onParticipantAdded (const Address &addr) override;
-	virtual void onParticipantRemoved (const Address &addr) override;
-	virtual void onParticipantSetAdmin (const Address &addr, bool isAdmin) override;
+	void onConferenceCreated (const Address &addr) override;
+	void onConferenceTerminated (const Address &addr) override;
+	void onParticipantAdded (const Address &addr) override;
+	void onParticipantRemoved (const Address &addr) override;
+	void onParticipantSetAdmin (const Address &addr, bool isAdmin) override;
 
 private:
 	L_DISABLE_COPY(RemoteConference);