diff --git a/Source/Core/VideoBackends/Null/PerfQuery.h b/Source/Core/VideoBackends/Null/PerfQuery.h
index 80e33753ba..0d43117951 100644
--- a/Source/Core/VideoBackends/Null/PerfQuery.h
+++ b/Source/Core/VideoBackends/Null/PerfQuery.h
@@ -8,7 +8,7 @@
 
 namespace Null
 {
-class PerfQuery : public PerfQueryBase
+class PerfQuery final : public PerfQueryBase
 {
 public:
   void EnableQuery(PerfQueryGroup type) override {}
diff --git a/Source/Core/VideoBackends/Null/Render.h b/Source/Core/VideoBackends/Null/Render.h
index 03f08e850d..21bd9c9c2c 100644
--- a/Source/Core/VideoBackends/Null/Render.h
+++ b/Source/Core/VideoBackends/Null/Render.h
@@ -8,7 +8,7 @@
 
 namespace Null
 {
-class Renderer : public ::Renderer
+class Renderer final : public ::Renderer
 {
 public:
   Renderer();
diff --git a/Source/Core/VideoBackends/Null/TextureCache.h b/Source/Core/VideoBackends/Null/TextureCache.h
index 7688004da2..b407c826e6 100644
--- a/Source/Core/VideoBackends/Null/TextureCache.h
+++ b/Source/Core/VideoBackends/Null/TextureCache.h
@@ -8,7 +8,7 @@
 
 namespace Null
 {
-class TextureCache : public TextureCacheBase
+class TextureCache final : public TextureCacheBase
 {
 protected:
   void CopyEFB(AbstractStagingTexture* dst, const EFBCopyParams& params, u32 native_width,
diff --git a/Source/Core/VideoBackends/Null/VertexManager.h b/Source/Core/VideoBackends/Null/VertexManager.h
index 2f45757f2e..ba9c2d7186 100644
--- a/Source/Core/VideoBackends/Null/VertexManager.h
+++ b/Source/Core/VideoBackends/Null/VertexManager.h
@@ -8,7 +8,7 @@
 
 namespace Null
 {
-class VertexManager : public VertexManagerBase
+class VertexManager final : public VertexManagerBase
 {
 public:
   VertexManager();
diff --git a/Source/Core/VideoBackends/Null/VideoBackend.h b/Source/Core/VideoBackends/Null/VideoBackend.h
index 8587854fc6..0930ccf7ad 100644
--- a/Source/Core/VideoBackends/Null/VideoBackend.h
+++ b/Source/Core/VideoBackends/Null/VideoBackend.h
@@ -8,7 +8,7 @@
 
 namespace Null
 {
-class VideoBackend : public VideoBackendBase
+class VideoBackend final : public VideoBackendBase
 {
   bool Initialize(const WindowSystemInfo& wsi) override;
   void Shutdown() override;