diff --git a/include/future b/include/future
index 66046835..73d5456d 100644
--- a/include/future
+++ b/include/future
@@ -2331,7 +2331,7 @@ private:
     }
 };
 
-inline bool __does_policy_contain(launch __policy, launch __value )
+inline _LIBCPP_INLINE_VISIBILITY bool __does_policy_contain(launch __policy, launch __value )
 { return (int(__policy) & int(__value)) != 0; }
 
 template <class _Fp, class... _Args>