diff --git a/include/rtc/h264packetizationhandler.hpp b/include/rtc/h264packetizationhandler.hpp
index be33d43..36429f1 100644
--- a/include/rtc/h264packetizationhandler.hpp
+++ b/include/rtc/h264packetizationhandler.hpp
@@ -28,7 +28,7 @@
 namespace rtc {
 
 /// Handler for H264 packetization
-class RTC_CPP_EXPORT H264PacketizationHandler : public MediaChainableHandler {
+class RTC_CPP_EXPORT H264PacketizationHandler final : public MediaChainableHandler {
 public:
 	/// Construct handler for H264 packetization.
 	/// @param packetizer RTP packetizer for h264
diff --git a/include/rtc/h264rtppacketizer.hpp b/include/rtc/h264rtppacketizer.hpp
index 7d8cf21..e16184e 100644
--- a/include/rtc/h264rtppacketizer.hpp
+++ b/include/rtc/h264rtppacketizer.hpp
@@ -28,7 +28,7 @@
 namespace rtc {
 
 /// RTP packetization of h264 payload
-class RTC_CPP_EXPORT H264RtpPacketizer : public RtpPacketizer, public MediaHandlerRootElement {
+class RTC_CPP_EXPORT H264RtpPacketizer final : public RtpPacketizer, public MediaHandlerRootElement {
 	shared_ptr<NalUnits> splitMessage(binary_ptr message);
 	const uint16_t maximumFragmentSize;
 
diff --git a/include/rtc/opuspacketizationhandler.hpp b/include/rtc/opuspacketizationhandler.hpp
index cfa54b1..37b6253 100644
--- a/include/rtc/opuspacketizationhandler.hpp
+++ b/include/rtc/opuspacketizationhandler.hpp
@@ -27,7 +27,7 @@
 namespace rtc {
 
 /// Handler for opus packetization
-class RTC_CPP_EXPORT OpusPacketizationHandler : public MediaChainableHandler {
+class RTC_CPP_EXPORT OpusPacketizationHandler final : public MediaChainableHandler {
 
 public:
 	/// Construct handler for opus packetization.
diff --git a/include/rtc/opusrtppacketizer.hpp b/include/rtc/opusrtppacketizer.hpp
index d0bbdf8..26f3786 100644
--- a/include/rtc/opusrtppacketizer.hpp
+++ b/include/rtc/opusrtppacketizer.hpp
@@ -27,7 +27,7 @@
 namespace rtc {
 
 /// RTP packetizer for opus
-class RTC_CPP_EXPORT OpusRtpPacketizer : public RtpPacketizer, public MediaHandlerRootElement {
+class RTC_CPP_EXPORT OpusRtpPacketizer final : public RtpPacketizer, public MediaHandlerRootElement {
 public:
 	/// default clock rate used in opus RTP communication
 	static const uint32_t defaultClockRate = 48 * 1000;
diff --git a/include/rtc/rtcpnackresponder.hpp b/include/rtc/rtcpnackresponder.hpp
index d6e2f2e..8377409 100644
--- a/include/rtc/rtcpnackresponder.hpp
+++ b/include/rtc/rtcpnackresponder.hpp
@@ -28,7 +28,7 @@
 
 namespace rtc {
 
-class RTC_CPP_EXPORT RtcpNackResponder: public MediaHandlerElement {
+class RTC_CPP_EXPORT RtcpNackResponder final: public MediaHandlerElement {
 
 	/// Packet storage
 	class RTC_CPP_EXPORT Storage {
diff --git a/include/rtc/rtcpsrreporter.hpp b/include/rtc/rtcpsrreporter.hpp
index 06a9c09..c4689cf 100644
--- a/include/rtc/rtcpsrreporter.hpp
+++ b/include/rtc/rtcpsrreporter.hpp
@@ -27,7 +27,7 @@
 
 namespace rtc {
 
-class RTC_CPP_EXPORT RtcpSrReporter: public MediaHandlerElement {
+class RTC_CPP_EXPORT RtcpSrReporter final: public MediaHandlerElement {
 
 	bool needsToReport = false;