diff --git a/src/frontend/mame/infoxml.cpp b/src/frontend/mame/infoxml.cpp
index 6adb5f5e588..70270e0a0f9 100644
--- a/src/frontend/mame/infoxml.cpp
+++ b/src/frontend/mame/infoxml.cpp
@@ -436,7 +436,13 @@ void info_xml_creator::output(std::ostream &out, const std::function<bool(const
 		prepared_info() = default;
 		prepared_info(const prepared_info &) = delete;
 		prepared_info(prepared_info &&) = default;
+#if defined(_CPPLIB_VER) && defined(_MSVC_STL_VERSION)
+		// MSVCPRT currently requires default-constructible std::future promise types to be assignable
+		// remove this workaround when that's fixed
+		prepared_info &operator=(const prepared_info &) = default;
+#else
 		prepared_info &operator=(const prepared_info &) = delete;
+#endif
 
 		std::string     m_xml_snippet;
 		device_type_set m_dev_set;