diff --git a/src/devices/cpu/drcbearm64.cpp b/src/devices/cpu/drcbearm64.cpp
index 52fdd67e82d..b20359aab07 100644
--- a/src/devices/cpu/drcbearm64.cpp
+++ b/src/devices/cpu/drcbearm64.cpp
@@ -8,6 +8,8 @@
 #include "emuopts.h"
 #include "uml.h"
 
+#include "mfpresolve.h"
+
 #include <cstddef>
 
 
diff --git a/src/lib/util/mfpresolve.h b/src/lib/util/mfpresolve.h
index c9a2eba6a95..4b4f62373d3 100644
--- a/src/lib/util/mfpresolve.h
+++ b/src/lib/util/mfpresolve.h
@@ -15,6 +15,7 @@
 #include "abi.h"
 
 #include <cassert>
+#include <cstddef>
 #include <cstdint>
 #include <utility>
 
@@ -66,7 +67,7 @@ inline std::pair<std::uintptr_t, std::uintptr_t> resolve_member_function(Ret (T:
 {
 	if (MAME_ABI_CXX_TYPE == MAME_ABI_CXX_ITANIUM)
 	{
-		struct { uintptr_t ptr; ptrdiff_t adj; } equiv;
+		struct { std::uintptr_t ptr; std::ptrdiff_t adj; } equiv;
 		static_assert(sizeof(function) == sizeof(equiv));
 		*reinterpret_cast<decltype(function) *>(&equiv) = function;
 		return detail::resolve_member_function_itanium(equiv.ptr, equiv.adj, object);