4 files changed, 4 insertions, 4 deletions
diff --git a/core/fpdfdoc/cpdf_occontext.h b/core/fpdfdoc/cpdf_occontext.h
index 67763610f4..16b28ba06f 100644
--- a/core/fpdfdoc/cpdf_occontext.h
+++ b/core/fpdfdoc/cpdf_occontext.h
@@ -17,7 +17,7 @@ class CPDF_Dictionary;
 class CPDF_Document;
 class CPDF_PageObject;
 
-class CPDF_OCContext : public Retainable {
+class CPDF_OCContext final : public Retainable {
  public:
   enum UsageType { View = 0, Design, Print, Export };
 
diff --git a/core/fpdfdoc/cpdf_structelement.h b/core/fpdfdoc/cpdf_structelement.h
index 79e8dd92c8..355599ff87 100644
--- a/core/fpdfdoc/cpdf_structelement.h
+++ b/core/fpdfdoc/cpdf_structelement.h
@@ -34,7 +34,7 @@ class CPDF_StructKid {
   uint32_t m_ContentId;   // For PageContent, StreamContent.
 };
 
-class CPDF_StructElement : public Retainable {
+class CPDF_StructElement final : public Retainable {
  public:
   template <typename T, typename... Args>
   friend RetainPtr<T> pdfium::MakeRetain(Args&&... args);
diff --git a/core/fpdfdoc/cpvt_floatrect.h b/core/fpdfdoc/cpvt_floatrect.h
index c5eb2202bb..4dca3aaa43 100644
--- a/core/fpdfdoc/cpvt_floatrect.h
+++ b/core/fpdfdoc/cpvt_floatrect.h
@@ -9,7 +9,7 @@
 
 #include "core/fxcrt/fx_coordinates.h"
 
-class CPVT_FloatRect : public CFX_FloatRect {
+class CPVT_FloatRect final : public CFX_FloatRect {
  public:
   CPVT_FloatRect() { left = top = right = bottom = 0.0f; }
 
diff --git a/core/fpdfdoc/cpvt_fontmap.h b/core/fpdfdoc/cpvt_fontmap.h
index f1a27753ac..6d8ca062c1 100644
--- a/core/fpdfdoc/cpvt_fontmap.h
+++ b/core/fpdfdoc/cpvt_fontmap.h
@@ -17,7 +17,7 @@ class CPDF_Document;
 class CPDF_Dictionary;
 class CPDF_Font;
 
-class CPVT_FontMap : public IPVT_FontMap {
+class CPVT_FontMap final : public IPVT_FontMap {
  public:
   CPVT_FontMap(CPDF_Document* pDoc,
                CPDF_Dictionary* pResDict,