diff --git a/include/__bit_reference b/include/__bit_reference
index 8180295..1621deb 100644
--- a/include/__bit_reference
+++ b/include/__bit_reference
@@ -81,6 +81,16 @@
 {
 };
 
+template <class _Cp>
+_LIBCPP_INLINE_VISIBILITY inline
+void
+swap(__bit_reference<_Cp> __x, __bit_reference<_Cp> __y) _NOEXCEPT
+{
+    bool __t = __x;
+    __x = __y;
+    __y = __t;
+}
+
 template <class _Cp, class _Dp>
 _LIBCPP_INLINE_VISIBILITY inline
 void