diff --git a/examples/org.freedesktop.DBus.ObjectManager/obj-manager-client.cpp b/examples/org.freedesktop.DBus.ObjectManager/obj-manager-client.cpp
index 60e7d14..25184f1 100644
--- a/examples/org.freedesktop.DBus.ObjectManager/obj-manager-client.cpp
+++ b/examples/org.freedesktop.DBus.ObjectManager/obj-manager-client.cpp
@@ -14,7 +14,7 @@
 #include <iostream>
 #include <thread>
 
-class PlanetProxy : public sdbus::ProxyInterfaces< org::sdbuscpp::ExampleManager::Planet1_proxy >
+class PlanetProxy final : public sdbus::ProxyInterfaces< org::sdbuscpp::ExampleManager::Planet1_proxy >
 {
 public:
     PlanetProxy(sdbus::IConnection& connection, std::string destination, std::string path)
@@ -29,7 +29,7 @@ public:
     }
 };
 
-class ManagerProxy : public sdbus::ProxyInterfaces< sdbus::ObjectManager_proxy >
+class ManagerProxy final : public sdbus::ProxyInterfaces< sdbus::ObjectManager_proxy >
 {
 public:
     ManagerProxy(sdbus::IConnection& connection, const std::string& destination, std::string path)
diff --git a/examples/org.freedesktop.DBus.ObjectManager/obj-manager-server.cpp b/examples/org.freedesktop.DBus.ObjectManager/obj-manager-server.cpp
index 78510e9..caadf52 100644
--- a/examples/org.freedesktop.DBus.ObjectManager/obj-manager-server.cpp
+++ b/examples/org.freedesktop.DBus.ObjectManager/obj-manager-server.cpp
@@ -34,7 +34,7 @@ public:
     }
 };
 
-class PlanetAdaptor : public sdbus::AdaptorInterfaces< org::sdbuscpp::ExampleManager::Planet1_adaptor,
+class PlanetAdaptor final : public sdbus::AdaptorInterfaces< org::sdbuscpp::ExampleManager::Planet1_adaptor,
                                                 sdbus::ManagedObject_adaptor,
                                                 sdbus::Properties_adaptor >
 {
diff --git a/tests/integrationtests/TestAdaptor.h b/tests/integrationtests/TestAdaptor.h
index 4b49612..392ec75 100644
--- a/tests/integrationtests/TestAdaptor.h
+++ b/tests/integrationtests/TestAdaptor.h
@@ -36,7 +36,7 @@
 
 namespace sdbus { namespace test {
 
-class ObjectManagerTestAdaptor : public sdbus::AdaptorInterfaces< sdbus::ObjectManager_adaptor >
+class ObjectManagerTestAdaptor final : public sdbus::AdaptorInterfaces< sdbus::ObjectManager_adaptor >
 {
 public:
     ObjectManagerTestAdaptor(sdbus::IConnection& connection, std::string path) :
diff --git a/tests/integrationtests/TestProxy.h b/tests/integrationtests/TestProxy.h
index 876f355..7c7da6a 100644
--- a/tests/integrationtests/TestProxy.h
+++ b/tests/integrationtests/TestProxy.h
@@ -35,7 +35,7 @@
 
 namespace sdbus { namespace test {
 
-class ObjectManagerTestProxy : public sdbus::ProxyInterfaces< sdbus::ObjectManager_proxy >
+class ObjectManagerTestProxy final : public sdbus::ProxyInterfaces< sdbus::ObjectManager_proxy >
 {
 public:
     ObjectManagerTestProxy(sdbus::IConnection& connection, std::string destination, std::string objectPath)