diff --git a/include/functional b/include/functional
index 73c6c590..391a5b60 100644
--- a/include/functional
+++ b/include/functional
@@ -1704,6 +1704,10 @@ class __bind_r
 public:
     typedef _R result_type;
 
+    _LIBCPP_INLINE_VISIBILITY
+    __bind_r(__bind_r&& __b)
+        : base(_STD::move(__b)) {}
+
     template <class _G, class ..._BA>
       _LIBCPP_INLINE_VISIBILITY
       explicit __bind_r(_G&& __f, _BA&& ...__bound_args)