diff --git a/libcxx/include/__debug b/libcxx/include/__debug
--- a/libcxx/include/__debug
+++ b/libcxx/include/__debug
@@ -45,15 +45,9 @@
     __i_node* __next_;
     __c_node* __c_;
 
-#ifndef _LIBCPP_CXX03_LANG
     __i_node(const __i_node&) = delete;
     __i_node& operator=(const __i_node&) = delete;
-#else
-private:
-    __i_node(const __i_node&);
-    __i_node& operator=(const __i_node&);
-public:
-#endif
+
     _LIBCPP_INLINE_VISIBILITY
     __i_node(void* __i, __i_node* __next, __c_node* __c)
         : __i_(__i), __next_(__next), __c_(__c) {}
@@ -68,15 +62,9 @@
     __i_node** end_;
     __i_node** cap_;
 
-#ifndef _LIBCPP_CXX03_LANG
     __c_node(const __c_node&) = delete;
     __c_node& operator=(const __c_node&) = delete;
-#else
-private:
-    __c_node(const __c_node&);
-    __c_node& operator=(const __c_node&);
-public:
-#endif
+
     _LIBCPP_INLINE_VISIBILITY
     __c_node(void* __c, __c_node* __next)
         : __c_(__c), __next_(__next), beg_(nullptr), end_(nullptr), cap_(nullptr) {}
@@ -155,15 +143,9 @@
 
     __libcpp_db();
 public:
-#ifndef _LIBCPP_CXX03_LANG
     __libcpp_db(const __libcpp_db&) = delete;
     __libcpp_db& operator=(const __libcpp_db&) = delete;
-#else
-private:
-    __libcpp_db(const __libcpp_db&);
-    __libcpp_db& operator=(const __libcpp_db&);
-public:
-#endif
+
     ~__libcpp_db();
 
     class __db_c_iterator;
diff --git a/libcxx/include/__iterator/reverse_access.h b/libcxx/include/__iterator/reverse_access.h
--- a/libcxx/include/__iterator/reverse_access.h
+++ b/libcxx/include/__iterator/reverse_access.h
@@ -21,8 +21,6 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if !defined(_LIBCPP_CXX03_LANG)
-
 #if _LIBCPP_STD_VER > 11
 
 template <class _Tp, size_t _Np>
@@ -95,9 +93,7 @@
     return _VSTD::rend(__c);
 }
 
-#endif
-
-#endif // !defined(_LIBCPP_CXX03_LANG)
+#endif // _LIBCPP_STD_VER > 11
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/libcxx/include/__memory/unique_ptr.h b/libcxx/include/__memory/unique_ptr.h
--- a/libcxx/include/__memory/unique_ptr.h
+++ b/libcxx/include/__memory/unique_ptr.h
@@ -263,7 +263,6 @@
   unique_ptr& operator=(unique_ptr const&) = delete;
 #endif
 
-
   _LIBCPP_INLINE_VISIBILITY
   ~unique_ptr() { reset(); }
 
@@ -485,7 +484,6 @@
   unique_ptr(unique_ptr const&) = delete;
   unique_ptr& operator=(unique_ptr const&) = delete;
 #endif
-
 public:
   _LIBCPP_INLINE_VISIBILITY
   ~unique_ptr() { reset(); }
diff --git a/libcxx/include/atomic b/libcxx/include/atomic
--- a/libcxx/include/atomic
+++ b/libcxx/include/atomic
@@ -1651,13 +1651,7 @@
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
     __atomic_base(_Tp __d) _NOEXCEPT : __a_(__d) {}
 
-#ifndef _LIBCPP_CXX03_LANG
     __atomic_base(const __atomic_base&) = delete;
-#else
-private:
-    _LIBCPP_INLINE_VISIBILITY
-    __atomic_base(const __atomic_base&);
-#endif
 };
 
 #if defined(__cpp_lib_atomic_is_always_lock_free)
@@ -2439,19 +2433,10 @@
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
     atomic_flag(bool __b) _NOEXCEPT : __a_(__b) {} // EXTENSION
 
-#ifndef _LIBCPP_CXX03_LANG
     atomic_flag(const atomic_flag&) = delete;
     atomic_flag& operator=(const atomic_flag&) = delete;
     atomic_flag& operator=(const atomic_flag&) volatile = delete;
-#else
-private:
-    _LIBCPP_INLINE_VISIBILITY
-    atomic_flag(const atomic_flag&);
-    _LIBCPP_INLINE_VISIBILITY
-    atomic_flag& operator=(const atomic_flag&);
-    _LIBCPP_INLINE_VISIBILITY
-    atomic_flag& operator=(const atomic_flag&) volatile;
-#endif
+
 } atomic_flag;