3 files changed, 6 insertions, 6 deletions
diff --git a/core/fxge/win32/cfx_windowsdib.h b/core/fxge/win32/cfx_windowsdib.h
index c64fc7dc16..4b7de7d5f9 100644
--- a/core/fxge/win32/cfx_windowsdib.h
+++ b/core/fxge/win32/cfx_windowsdib.h
@@ -24,7 +24,7 @@ struct WINDIB_Open_Args_ {
   const wchar_t* path_name;
 };
 
-class CFX_WindowsDIB : public CFX_DIBitmap {
+class CFX_WindowsDIB final : public CFX_DIBitmap {
  public:
   template <typename T, typename... Args>
   friend RetainPtr<T> pdfium::MakeRetain(Args&&... args);
diff --git a/core/fxge/win32/cpsoutput.h b/core/fxge/win32/cpsoutput.h
index 49317a64a5..04e5ac1fa0 100644
--- a/core/fxge/win32/cpsoutput.h
+++ b/core/fxge/win32/cpsoutput.h
@@ -12,7 +12,7 @@
 #include "core/fxcrt/fx_stream.h"
 #include "core/fxcrt/fx_system.h"
 
-class CPSOutput : public IFX_WriteStream {
+class CPSOutput final : public IFX_WriteStream {
  public:
   enum class OutputMode { kExtEscape, kGdiComment };
 
diff --git a/core/fxge/win32/win32_int.h b/core/fxge/win32/win32_int.h
index 76a1d8800e..0bc68c46b9 100644
--- a/core/fxge/win32/win32_int.h
+++ b/core/fxge/win32/win32_int.h
@@ -188,7 +188,7 @@ class CGdiDeviceDriver : public RenderDeviceDriverIface {
   int m_RenderCaps;
 };
 
-class CGdiDisplayDriver : public CGdiDeviceDriver {
+class CGdiDisplayDriver final : public CGdiDeviceDriver {
  public:
   explicit CGdiDisplayDriver(HDC hDC);
   ~CGdiDisplayDriver() override;
@@ -229,7 +229,7 @@ class CGdiDisplayDriver : public CGdiDeviceDriver {
                              int render_flags);
 };
 
-class CGdiPrinterDriver : public CGdiDeviceDriver {
+class CGdiPrinterDriver final : public CGdiDeviceDriver {
  public:
   explicit CGdiPrinterDriver(HDC hDC);
   ~CGdiPrinterDriver() override;
@@ -269,7 +269,7 @@ class CGdiPrinterDriver : public CGdiDeviceDriver {
   const int m_VertSize;
 };
 
-class CPSPrinterDriver : public RenderDeviceDriverIface {
+class CPSPrinterDriver final : public RenderDeviceDriverIface {
  public:
   CPSPrinterDriver(HDC hDC, WindowsPrintMode mode, bool bCmykOutput);
   ~CPSPrinterDriver() override;
@@ -334,7 +334,7 @@ class CPSPrinterDriver : public RenderDeviceDriverIface {
   CFX_PSRenderer m_PSRenderer;
 };
 
-class CTextOnlyPrinterDriver : public RenderDeviceDriverIface {
+class CTextOnlyPrinterDriver final : public RenderDeviceDriverIface {
  public:
   explicit CTextOnlyPrinterDriver(HDC hDC);
   ~CTextOnlyPrinterDriver() override;