diff --git a/src/openrct2/audio/AudioMixer.cpp b/src/openrct2/audio/AudioMixer.cpp
index a62da013ec..d0b06e7dd4 100644
--- a/src/openrct2/audio/AudioMixer.cpp
+++ b/src/openrct2/audio/AudioMixer.cpp
@@ -68,7 +68,7 @@ public:
     }
 };
 
-class AudioMixer : public IAudioMixer
+class AudioMixer final : public IAudioMixer
 {
 private:
     IAudioSource * _nullSource = nullptr;
diff --git a/src/openrct2/audio/FileAudioSource.cpp b/src/openrct2/audio/FileAudioSource.cpp
index c1d730b42e..5441fe063f 100644
--- a/src/openrct2/audio/FileAudioSource.cpp
+++ b/src/openrct2/audio/FileAudioSource.cpp
@@ -34,7 +34,7 @@
  * An audio source where raw PCM data is streamed directly from
  * a file.
  */
-class FileAudioSource : public IAudioSource
+class FileAudioSource final : public IAudioSource
 {
 private:
     AudioFormat _format = { 0 };
diff --git a/src/openrct2/audio/MemoryAudioSource.cpp b/src/openrct2/audio/MemoryAudioSource.cpp
index ad358149a5..0c80304adb 100644
--- a/src/openrct2/audio/MemoryAudioSource.cpp
+++ b/src/openrct2/audio/MemoryAudioSource.cpp
@@ -37,7 +37,7 @@
  * An audio source where raw PCM data is initially loaded into RAM from
  * a file and then streamed.
  */
-class MemoryAudioSource : public IAudioSource
+class MemoryAudioSource final : public IAudioSource
 {
 private:
     AudioFormat _format = { 0 };
diff --git a/src/openrct2/core/Zip.cpp b/src/openrct2/core/Zip.cpp
index 9dad0b72a4..98a5f9252b 100644
--- a/src/openrct2/core/Zip.cpp
+++ b/src/openrct2/core/Zip.cpp
@@ -18,7 +18,7 @@
 #include "IStream.hpp"
 #include "Zip.h"
 
-class ZipArchive : public IZipArchive
+class ZipArchive final : public IZipArchive
 {
 private:
     zip_t *     _zip;
diff --git a/src/openrct2/drawing/engines/opengl/OpenGLDrawingEngine.cpp b/src/openrct2/drawing/engines/opengl/OpenGLDrawingEngine.cpp
index fbddc2e795..0055bc03ad 100644
--- a/src/openrct2/drawing/engines/opengl/OpenGLDrawingEngine.cpp
+++ b/src/openrct2/drawing/engines/opengl/OpenGLDrawingEngine.cpp
@@ -172,7 +172,7 @@ static const vec3f TransparentColourTable[144 - 44] =
 
 class OpenGLDrawingEngine;
 
-class OpenGLDrawingContext : public IDrawingContext
+class OpenGLDrawingContext final : public IDrawingContext
 {
 private:
     OpenGLDrawingEngine *   _engine;
diff --git a/src/openrct2/drawing/engines/opengl/OpenGLShaderProgram.h b/src/openrct2/drawing/engines/opengl/OpenGLShaderProgram.h
index 9231a6a105..308ef7888d 100644
--- a/src/openrct2/drawing/engines/opengl/OpenGLShaderProgram.h
+++ b/src/openrct2/drawing/engines/opengl/OpenGLShaderProgram.h
@@ -19,7 +19,7 @@
 #include "../../../common.h"
 #include "OpenGLAPI.h"
 
-class OpenGLShader
+class OpenGLShader final
 {
 private:
     static constexpr uint64 MaxSourceSize = 8 * 1024 * 1024; // 8 MiB
@@ -29,7 +29,7 @@ private:
 
 public:
     OpenGLShader(const char * name, GLenum type);
-    virtual ~OpenGLShader();
+    ~OpenGLShader();
 
     GLuint GetShaderId();
 
diff --git a/src/openrct2/network/TcpSocket.cpp b/src/openrct2/network/TcpSocket.cpp
index 2b8a6ebdf5..7b6e9ed00e 100644
--- a/src/openrct2/network/TcpSocket.cpp
+++ b/src/openrct2/network/TcpSocket.cpp
@@ -81,7 +81,7 @@ struct ConnectRequest
     uint16      Port;
 };
 
-class TcpSocket : public ITcpSocket
+class TcpSocket final : public ITcpSocket
 {
 private:
     SOCKET_STATUS   _status         = SOCKET_STATUS_CLOSED;
diff --git a/src/openrct2/object/Object.h b/src/openrct2/object/Object.h
index 6474b2dc39..2f585c31a9 100644
--- a/src/openrct2/object/Object.h
+++ b/src/openrct2/object/Object.h
@@ -78,7 +78,7 @@ public:
 
     virtual void DrawPreview(rct_drawpixelinfo * dpi, sint32 width, sint32 height) const { }
 
-    virtual uint8           GetObjectType() const { return _objectEntry.flags & 0x0F; }
+    virtual uint8           GetObjectType() const final { return _objectEntry.flags & 0x0F; }
     virtual const utf8 *    GetName() const;
 
     virtual void SetRepositoryItem(ObjectRepositoryItem * item) const { }
diff --git a/src/openrct2/object/ObjectManager.cpp b/src/openrct2/object/ObjectManager.cpp
index ebe208dd4d..c5f5706efc 100644
--- a/src/openrct2/object/ObjectManager.cpp
+++ b/src/openrct2/object/ObjectManager.cpp
@@ -33,7 +33,7 @@ extern "C"
     #include "../object_list.h"
 }
 
-class ObjectManager : public IObjectManager
+class ObjectManager final : public IObjectManager
 {
 private:
     IObjectRepository * _objectRepository;
diff --git a/src/openrct2/object/ObjectRepository.cpp b/src/openrct2/object/ObjectRepository.cpp
index 209cf20a08..bdc8a90a9e 100644
--- a/src/openrct2/object/ObjectRepository.cpp
+++ b/src/openrct2/object/ObjectRepository.cpp
@@ -92,7 +92,7 @@ using ObjectEntryMap = std::unordered_map<rct_object_entry, size_t, ObjectEntryH
 
 static void ReportMissingObject(const rct_object_entry * entry);
 
-class ObjectRepository : public IObjectRepository
+class ObjectRepository final : public IObjectRepository
 {
     IPlatformEnvironment *              _env = nullptr;
     std::vector<ObjectRepositoryItem>   _items;
@@ -107,7 +107,7 @@ public:
         _env = env;
     }
 
-    ~ObjectRepository()
+    ~ObjectRepository() final
     {
         ClearItems();
     }
@@ -160,7 +160,7 @@ public:
         return nullptr;
     }
 
-    const ObjectRepositoryItem * FindObject(const rct_object_entry * objectEntry) const override
+    const ObjectRepositoryItem * FindObject(const rct_object_entry * objectEntry) const override final
     {
         auto kvp = _itemMap.find(*objectEntry);
         if (kvp != _itemMap.end())
diff --git a/src/openrct2/rct1/S4Importer.cpp b/src/openrct2/rct1/S4Importer.cpp
index bb9dcf63ff..0ae593e0fd 100644
--- a/src/openrct2/rct1/S4Importer.cpp
+++ b/src/openrct2/rct1/S4Importer.cpp
@@ -87,7 +87,7 @@ public:
     }
 };
 
-class S4Importer : public IS4Importer
+class S4Importer final : public IS4Importer
 {
 private:
     const utf8 * _s4Path;
diff --git a/src/openrct2/ride/TrackDesignRepository.cpp b/src/openrct2/ride/TrackDesignRepository.cpp
index 992894a400..5c9ceb8f99 100644
--- a/src/openrct2/ride/TrackDesignRepository.cpp
+++ b/src/openrct2/ride/TrackDesignRepository.cpp
@@ -63,7 +63,7 @@ enum TRACK_REPO_ITEM_FLAGS
     TRIF_READ_ONLY = (1 << 0),
 };
 
-class TrackDesignRepository : public ITrackDesignRepository
+class TrackDesignRepository final : public ITrackDesignRepository
 {
 private:
     static constexpr const utf8 * TD_FILE_PATTERN = "*.td4;*.td6";
@@ -81,7 +81,7 @@ public:
         _env = env;
     }
 
-    virtual ~TrackDesignRepository()
+    virtual ~TrackDesignRepository() final
     {
     }
 
diff --git a/src/openrct2/title/TitleSequencePlayer.cpp b/src/openrct2/title/TitleSequencePlayer.cpp
index eddb8751ef..9043c6a82b 100644
--- a/src/openrct2/title/TitleSequencePlayer.cpp
+++ b/src/openrct2/title/TitleSequencePlayer.cpp
@@ -35,7 +35,7 @@ extern "C"
     #include "../world/scenery.h"
 }
 
-class TitleSequencePlayer : public ITitleSequencePlayer
+class TitleSequencePlayer final : public ITitleSequencePlayer
 {
 private:
     uint32          _sequenceId = 0;