1 files changed, 1 insertions, 1 deletions
diff --git a/core/fpdfapi/parser/cpdf_object_walker.h b/core/fpdfapi/parser/cpdf_object_walker.h
index 57506b9545..e0fd35de29 100644
--- a/core/fpdfapi/parser/cpdf_object_walker.h
+++ b/core/fpdfapi/parser/cpdf_object_walker.h
@@ -55,7 +55,7 @@ class CPDF_ObjectWalker {
   std::stack<std::unique_ptr<SubobjectIterator>> stack_;
 };
 
-class CPDF_NonConstObjectWalker : public CPDF_ObjectWalker {
+class CPDF_NonConstObjectWalker final : public CPDF_ObjectWalker {
  public:
   explicit CPDF_NonConstObjectWalker(CPDF_Object* root)
       : CPDF_ObjectWalker(root) {}