diff --git a/googletest/include/gtest/internal/gtest-param-util.h b/googletest/include/gtest/internal/gtest-param-util.h
index a092a86ad..f2723af25 100644
--- a/googletest/include/gtest/internal/gtest-param-util.h
+++ b/googletest/include/gtest/internal/gtest-param-util.h
@@ -99,6 +99,7 @@ class ParamGenerator;
 template <typename T>
 class ParamIteratorInterface {
  public:
+  ParamIteratorInterface() = default;
   virtual ~ParamIteratorInterface() = default;
   // A pointer to the base generator instance.
   // Used only for the purposes of iterator comparison
@@ -121,6 +122,9 @@ class ParamIteratorInterface {
   // element in the sequence generated by the generator.
   // Used for implementing ParamGenerator<T>::operator==().
   virtual bool Equals(const ParamIteratorInterface& other) const = 0;
+ protected:
+  // Make available for subclasses to use to implement Clone().
+  ParamIteratorInterface(const ParamIteratorInterface&) = default;
 };
 
 // Class iterating over elements provided by an implementation of
@@ -842,7 +846,7 @@ class CartesianProductGenerator
   template <class I>
   class IteratorImpl;
   template <size_t... I>
-  class IteratorImpl<std::index_sequence<I...>>
+  class IteratorImpl<std::index_sequence<I...>> final
       : public ParamIteratorInterface<ParamType> {
    public:
     IteratorImpl(const ParamGeneratorInterface<ParamType>* base,
@@ -854,7 +858,7 @@ class CartesianProductGenerator
           current_(is_end ? end_ : begin_) {
       ComputeCurrentValue();
     }
-    ~IteratorImpl() override = default;
+    ~IteratorImpl() final = default;
 
     const ParamGeneratorInterface<ParamType>* BaseGenerator() const override {
       return base_;
@@ -898,6 +902,8 @@ class CartesianProductGenerator
     }
 
    private:
+    IteratorImpl(const IteratorImpl&) = default;
+
     template <size_t ThisI>
     void AdvanceIfEnd() {
       if (std::get<ThisI>(current_) != std::get<ThisI>(end_)) return;