diff --git a/include/boost/openmethod/policies/minimal_perfect_hash.hpp b/include/boost/openmethod/policies/minimal_perfect_hash.hpp
index 866f9e0..ef0082c 100644
--- a/include/boost/openmethod/policies/minimal_perfect_hash.hpp
+++ b/include/boost/openmethod/policies/minimal_perfect_hash.hpp
@@ -21,17 +21,6 @@ namespace boost::openmethod {
 
 namespace detail {
 
-#if defined(UINTPTR_MAX)
-using uintptr = std::uintptr_t;
-constexpr uintptr uintptr_max = UINTPTR_MAX;
-#else
-static_assert(
-    sizeof(std::size_t) == sizeof(void*),
-    "This implementation requires that size_t and void* have the same size.");
-using uintptr = std::size_t;
-constexpr uintptr uintptr_max = (std::numeric_limits<std::size_t>::max)();
-#endif
-
 template<class Registry>
 std::vector<type_id> minimal_perfect_hash_control;