diff --git a/libstdc++-v3/include/bits/hashtable.h b/libstdc++-v3/include/bits/hashtable.h
index f7b8905d8ab..48695c013f3 100644
--- a/libstdc++-v3/include/bits/hashtable.h
+++ b/libstdc++-v3/include/bits/hashtable.h
@@ -3012,7 +3012,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       = __enable_if_t<!__or_<is_integral<_Hash>, __is_allocator<_Hash>>::value>;
 #endif
 
-#ifdef __cpp_concepts
+#ifdef __glibcxx_associative_heterogeneous_erasure // C++ >= 23
 template <typename _Kt, typename _Container>
   concept __heterogeneous_hash_key =
     __transparent_comparator<typename _Container::hasher> &&
diff --git a/libstdc++-v3/include/bits/stl_function.h b/libstdc++-v3/include/bits/stl_function.h
index 1312564216b..95c24d44b9e 100644
--- a/libstdc++-v3/include/bits/stl_function.h
+++ b/libstdc++-v3/include/bits/stl_function.h
@@ -1525,7 +1525,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #endif
 #endif
 
-#ifdef __glibcxx_associative_heterogeneous_erasure
+#ifdef __glibcxx_associative_heterogeneous_erasure // C++ >= 23
 template <typename _Kt, typename _Container>
   concept __not_container_iterator =
     (!is_convertible_v<_Kt&&, typename _Container::iterator> &&
diff --git a/libstdc++-v3/include/bits/stl_tree.h b/libstdc++-v3/include/bits/stl_tree.h
index 7a733241ec5..5d361b55028 100644
--- a/libstdc++-v3/include/bits/stl_tree.h
+++ b/libstdc++-v3/include/bits/stl_tree.h
@@ -3315,7 +3315,7 @@ namespace __rb_tree
     };
 #endif // C++17
 
-#ifdef __cpp_concepts
+#ifdef __glibcxx_associative_heterogeneous_erasure // C++ >= 23
 template <typename _Kt, typename _Container>
   concept __heterogeneous_tree_key =
     __transparent_comparator<typename _Container::key_compare> &&