diff --git a/xs/src/libslic3r/Int128.hpp b/xs/src/libslic3r/Int128.hpp
index 0aeb927a7..7bf0c87b4 100644
--- a/xs/src/libslic3r/Int128.hpp
+++ b/xs/src/libslic3r/Int128.hpp
@@ -50,7 +50,7 @@
 #include <cassert>
 #include "Point.hpp"
 
-#ifndef _MSC_VER
+#if ! defined(_MSC_VER) && defined(__SIZEOF_INT128__)
 	#define HAS_INTRINSIC_128_TYPE
 #endif