diff --git a/include/__config b/include/__config
index e4caecf02..d7e9014c8 100644
--- a/include/__config
+++ b/include/__config
@@ -415,6 +415,7 @@ using namespace _LIBCPP_NAMESPACE __attribute__((__strong__));
 #define _LIBCPP_HAS_NO_CONSTEXPR
 #define _LIBCPP_HAS_NO_UNICODE_CHARS
 #define _LIBCPP_HAS_NO_DELETED_FUNCTIONS
+#define _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
 #define __alignof__ __alignof
 #define _LIBCPP_NORETURN __declspec(noreturn)
 #define _ALIGNAS(x) __declspec(align(x))
diff --git a/include/system_error b/include/system_error
index afc73f29a..66bf6d6c4 100644
--- a/include/system_error
+++ b/include/system_error
@@ -371,7 +371,7 @@ public:
     error_category() _NOEXCEPT;
 #else
     _LIBCPP_ALWAYS_INLINE
-    _LIBCPP_CONSTEXPR_AFTER_CXX11 error_category() _NOEXCEPT = default;
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 error_category() _NOEXCEPT _LIBCPP_DEFAULT;
 #endif
 private:
     error_category(const error_category&);// = delete;