diff --git a/libcxx/include/__ranges/as_rvalue_view.h b/libcxx/include/__ranges/as_rvalue_view.h
--- a/libcxx/include/__ranges/as_rvalue_view.h
+++ b/libcxx/include/__ranges/as_rvalue_view.h
@@ -125,7 +125,7 @@
 } // namespace __as_rvalue
 
 inline namespace __cpo {
-constexpr auto as_rvalue = __as_rvalue::__fn{};
+inline constexpr auto as_rvalue = __as_rvalue::__fn{};
 } // namespace __cpo
 } // namespace views
 } // namespace ranges