diff --git a/include/WinStd/WinHTTP.h b/include/WinStd/WinHTTP.h
index 8d1a8a8b..e32c9a7e 100644
--- a/include/WinStd/WinHTTP.h
+++ b/include/WinStd/WinHTTP.h
@@ -212,7 +212,7 @@ namespace winstd
             last_error_saver last_error_save;
             std::wstring wstr;
             winstd::library winhttp(LoadLibraryW(L"WINHTTP.DLL"));
-            if (WINHTTP_ERROR_BASE < num && num <= WINHTTP_ERROR_LAST && winhttp && FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_FROM_HMODULE | FORMAT_MESSAGE_IGNORE_INSERTS, (HMODULE)winhttp, num, dwLanguageId, wstr, NULL) ||
+            if (WINHTTP_ERROR_BASE < num && num <= WINHTTP_ERROR_LAST && winhttp.valid() && FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_FROM_HMODULE | FORMAT_MESSAGE_IGNORE_INSERTS, (HMODULE)winhttp, num, dwLanguageId, wstr, NULL) ||
                 FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, 0, num, dwLanguageId, wstr, NULL)) {
                 // Stock Windows error messages contain CRLF. Well... Trim all the trailing white space.
                 wstr.erase(wstr.find_last_not_of(L" \t\n\r\f\v") + 1);