diff --git a/include/tao/pq/result.hpp b/include/tao/pq/result.hpp
index caeb1d7..5075e09 100644
--- a/include/tao/pq/result.hpp
+++ b/include/tao/pq/result.hpp
@@ -33,13 +33,6 @@ namespace tao::pq
    class table_writer;
    class transaction;
 
-   namespace internal
-   {
-      template< typename T >
-      concept has_reserve = requires( T t, typename T::size_type s ) { t.reserve( s ); };
-
-   }  // namespace internal
-
    class result final
    {
    private:
@@ -265,7 +258,7 @@ namespace tao::pq
       [[nodiscard]] auto as_container() const -> T
       {
          T nrv;
-         if constexpr( internal::has_reserve< T > ) {
+         if constexpr( requires { nrv.reserve( size() ); } ) {
             nrv.reserve( size() );
          }
          check_has_result_set();
diff --git a/src/test/pq/has_reserve.cpp b/src/test/pq/has_reserve.cpp
deleted file mode 100644
index d6ac2f7..0000000
--- a/src/test/pq/has_reserve.cpp
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright (c) 2021-2024 Daniel Frey and Dr. Colin Hirsch
-// Distributed under the Boost Software License, Version 1.0.
-// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
-
-#include <tao/pq/result.hpp>
-
-static_assert( !tao::pq::internal::has_reserve< std::list< int > > );
-static_assert( tao::pq::internal::has_reserve< std::vector< int > > );
-
-auto main() -> int
-{}