diff --git a/src/background-parsing-task.h b/src/background-parsing-task.h
index 1bf9d74121..bd96ee1f85 100644
--- a/src/background-parsing-task.h
+++ b/src/background-parsing-task.h
@@ -39,10 +39,9 @@ struct StreamedSource {
   std::unique_ptr<ParseInfo> info;
   std::unique_ptr<Parser> parser;
 
- private:
-  // Prevent copying. Not implemented.
-  StreamedSource(const StreamedSource&);
-  StreamedSource& operator=(const StreamedSource&);
+  // Prevent copying.
+  StreamedSource(const StreamedSource&) = delete;
+  StreamedSource& operator=(const StreamedSource&) = delete;
 };
 
 
diff --git a/src/frames.h b/src/frames.h
index 12770231cf..102372886c 100644
--- a/src/frames.h
+++ b/src/frames.h
@@ -525,6 +525,8 @@ class StackFrame BASE_EMBEDDED {
 
   Isolate* isolate() const { return isolate_; }
 
+  void operator=(const StackFrame& original) = delete;
+
  protected:
   inline explicit StackFrame(StackFrameIteratorBase* iterator);
   virtual ~StackFrame() { }
@@ -563,9 +565,6 @@ class StackFrame BASE_EMBEDDED {
   friend class StackFrameIteratorBase;
   friend class StackHandlerIterator;
   friend class SafeStackFrameIterator;
-
- private:
-  void operator=(const StackFrame& original);
 };
 
 
diff --git a/src/handles.h b/src/handles.h
index a7cd0e2497..a7eb31efca 100644
--- a/src/handles.h
+++ b/src/handles.h
@@ -293,8 +293,6 @@ class HandleScope {
 
  private:
   // Prevent heap allocation or illegal handle scopes.
-  HandleScope(const HandleScope&);
-  void operator=(const HandleScope&);
   void* operator new(size_t size);
   void operator delete(void* size_t);
 
@@ -320,6 +318,8 @@ class HandleScope {
   friend class DeferredHandleScope;
   friend class HandleScopeImplementer;
   friend class Isolate;
+
+  DISALLOW_COPY_AND_ASSIGN(HandleScope);
 };