4 files changed, 4 insertions, 4 deletions
diff --git a/core/fpdfapi/render/cpdf_dibbase.h b/core/fpdfapi/render/cpdf_dibbase.h
index a1008470b6..423069db25 100644
--- a/core/fpdfapi/render/cpdf_dibbase.h
+++ b/core/fpdfapi/render/cpdf_dibbase.h
@@ -39,7 +39,7 @@ struct DIB_COMP_DATA {
 
 #define FPDF_HUGE_IMAGE_SIZE 60000000
 
-class CPDF_DIBBase : public CFX_DIBBase {
+class CPDF_DIBBase final : public CFX_DIBBase {
  public:
   enum class LoadState : uint8_t { kFail, kSuccess, kContinue };
 
diff --git a/core/fpdfapi/render/cpdf_dibtransferfunc.h b/core/fpdfapi/render/cpdf_dibtransferfunc.h
index 61abd2e23c..62e0157665 100644
--- a/core/fpdfapi/render/cpdf_dibtransferfunc.h
+++ b/core/fpdfapi/render/cpdf_dibtransferfunc.h
@@ -15,7 +15,7 @@
 
 class CPDF_TransferFunc;
 
-class CPDF_DIBTransferFunc : public CFX_FilteredDIB {
+class CPDF_DIBTransferFunc final : public CFX_FilteredDIB {
  public:
   template <typename T, typename... Args>
   friend RetainPtr<T> pdfium::MakeRetain(Args&&... args);
diff --git a/core/fpdfapi/render/cpdf_transferfunc.h b/core/fpdfapi/render/cpdf_transferfunc.h
index e8964727c6..d45184eb92 100644
--- a/core/fpdfapi/render/cpdf_transferfunc.h
+++ b/core/fpdfapi/render/cpdf_transferfunc.h
@@ -14,7 +14,7 @@
 class CPDF_Document;
 class CFX_DIBBase;
 
-class CPDF_TransferFunc : public Retainable {
+class CPDF_TransferFunc final : public Retainable {
  public:
   template <typename T, typename... Args>
   friend RetainPtr<T> pdfium::MakeRetain(Args&&... args);
diff --git a/core/fpdfapi/render/cpdf_type3cache.h b/core/fpdfapi/render/cpdf_type3cache.h
index f0bfbd63b6..de802c589b 100644
--- a/core/fpdfapi/render/cpdf_type3cache.h
+++ b/core/fpdfapi/render/cpdf_type3cache.h
@@ -18,7 +18,7 @@
 
 class CPDF_Type3Glyphs;
 
-class CPDF_Type3Cache : public Retainable {
+class CPDF_Type3Cache final : public Retainable {
  public:
   template <typename T, typename... Args>
   friend RetainPtr<T> pdfium::MakeRetain(Args&&... args);