1 files changed, 1 insertions, 1 deletions
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);