diff --git a/libcxx/test/std/library/description/conventions/customization.point.object/cpo.compile.pass.cpp b/libcxx/test/std/library/description/conventions/customization.point.object/cpo.compile.pass.cpp
index 4cd461631838d..819aeb454a45c 100644
--- a/libcxx/test/std/library/description/conventions/customization.point.object/cpo.compile.pass.cpp
+++ b/libcxx/test/std/library/description/conventions/customization.point.object/cpo.compile.pass.cpp
@@ -13,13 +13,16 @@
 // [range.adaptor.object] "A range adaptor object is a customization point object..."
 
 #include <compare>
+#include <concepts>
 #include <iterator>
 #include <ranges>
+#include <type_traits>
 #include <utility>
 
 // Test for basic properties of C++20 16.3.3.3.6 [customization.point.object].
 template <class CPO, class... Args>
 constexpr bool test(CPO& o, Args&&...) {
+  static_assert(std::is_const_v<CPO>);
   static_assert(std::is_class_v<CPO>);
   static_assert(std::is_trivial_v<CPO>);
 
diff --git a/libcxx/test/std/library/description/conventions/customization.point.object/niebloid.compile.pass.cpp b/libcxx/test/std/library/description/conventions/customization.point.object/niebloid.compile.pass.cpp
index fcca5813dcb31..532fa5786f8e1 100644
--- a/libcxx/test/std/library/description/conventions/customization.point.object/niebloid.compile.pass.cpp
+++ b/libcxx/test/std/library/description/conventions/customization.point.object/niebloid.compile.pass.cpp
@@ -32,6 +32,7 @@
 
 template <class CPO, class... Args>
 constexpr bool test(CPO& o, Args&&...) {
+  static_assert(std::is_const_v<CPO>);
   static_assert(std::is_class_v<CPO>);
   static_assert(std::is_trivial_v<CPO>);