diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3748187..9d5219e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -156,6 +156,7 @@ if (UPA_BUILD_TESTS)
       test/test-url.cpp
       test/test-url-port.cpp
       test/test-url-setters.cpp
+      test/test-url_for_.cpp
       test/test-url_host.cpp
       test/test-url_percent_encode.cpp
       test/test-url_search_params.cpp
diff --git a/include/upa/url_for_atl.h b/include/upa/url_for_atl.h
index f3a1979..206e6b5 100644
--- a/include/upa/url_for_atl.h
+++ b/include/upa/url_for_atl.h
@@ -5,20 +5,55 @@
 #ifndef UPA_URL_FOR_ATL_H
 #define UPA_URL_FOR_ATL_H
 
+#include "config.h"
 #include "url.h" // IWYU pragma: export
-#include <cstringt.h>
+#include <atlsimpstr.h>
+#ifdef UPA_CPP_20
+# include <concepts>
+#else
+# include <cstringt.h>
+#endif
 
 namespace upa {
 
-template<typename CharT, class StringTraits>
-struct str_arg_char<ATL::CStringT<CharT, StringTraits>> {
-    using type = CharT;
+template<class StrT>
+struct str_arg_char_for_atl {
+    using type = typename StrT::XCHAR;
 
-    static str_arg<CharT> to_str_arg(const ATL::CStringT<CharT, StringTraits>& str) {
+    static str_arg<type> to_str_arg(const StrT& str) {
         return { str.GetString(), static_cast<std::ptrdiff_t>(str.GetLength()) };
     }
 };
 
+#ifdef UPA_CPP_20
+
+// CStringT and CFixedStringT are derived from CSimpleStringT
+template<class StrT>
+concept derived_from_CSimpleString =
+    std::derived_from<StrT, ATL::CSimpleStringT<char, true>> ||
+    std::derived_from<StrT, ATL::CSimpleStringT<wchar_t, true>> ||
+    std::derived_from<StrT, ATL::CSimpleStringT<char, false>> ||
+    std::derived_from<StrT, ATL::CSimpleStringT<wchar_t, false>>;
+
+template<derived_from_CSimpleString StrT>
+struct str_arg_char<StrT> : public str_arg_char_for_atl<StrT> {};
+
+#else // UPA_CPP_20
+
+template<typename CharT, bool mfcdll>
+struct str_arg_char<ATL::CSimpleStringT<CharT, mfcdll>> :
+    public str_arg_char_for_atl<ATL::CSimpleStringT<CharT, mfcdll>> {};
+
+template<typename CharT, class StringTraits>
+struct str_arg_char<ATL::CStringT<CharT, StringTraits>> :
+    public str_arg_char_for_atl<ATL::CStringT<CharT, StringTraits>> {};
+
+template<class StrT, int nChars>
+struct str_arg_char<ATL::CFixedStringT<StrT, nChars>> :
+    public str_arg_char_for_atl<ATL::CFixedStringT<StrT, nChars>> {};
+
+#endif // UPA_CPP_20
+
 } // namespace upa
 
 #endif // UPA_URL_FOR_ATL_H
diff --git a/test/test-url_for_.cpp b/test/test-url_for_.cpp
new file mode 100644
index 0000000..8be19bb
--- /dev/null
+++ b/test/test-url_for_.cpp
@@ -0,0 +1,44 @@
+// Copyright 2024 Rimas Misevičius
+// Distributed under the BSD-style license that can be
+// found in the LICENSE file.
+//
+
+#include "doctest-main.h"
+
+#ifdef _MSC_VER
+# define UPA_TEST_URL_FOR_ATL
+# include "upa/url_for_atl.h"
+# include <atlsimpstr.h>
+# include <atlstr.h>
+# include <cstringt.h>
+#endif
+
+#ifdef UPA_TEST_URL_FOR_ATL
+
+TEST_CASE("ATL::CSimpleStringA input") {
+    ATL::CStringA basestr;
+
+    ATL::CSimpleStringA str_input("http://host/", basestr.GetManager());
+    upa::url url{ str_input };
+    CHECK(url.href() == "http://host/");
+}
+
+TEST_CASE("ATL::CSimpleStringW input") {
+    ATL::CStringW basestr;
+
+    ATL::CSimpleStringW str_input(L"http://host/", basestr.GetManager());
+    upa::url url{ str_input };
+    CHECK(url.href() == "http://host/");
+}
+
+TEST_CASE_TEMPLATE_DEFINE("ATL string input", StrT, test_url_for_atl) {
+    StrT str_input("http://host/");
+    upa::url url{ str_input };
+    CHECK(url.href() == "http://host/");
+}
+
+TEST_CASE_TEMPLATE_INVOKE(test_url_for_atl,
+    ATL::CStringA, ATL::CFixedStringT<ATL::CStringA, 16>,
+    ATL::CStringW, ATL::CFixedStringT<ATL::CStringW, 16>);
+
+#endif // UPA_TEST_URL_FOR_ATL