diff --git a/neo/portability/inttypes.h b/neo/portability/inttypes.h
new file mode 100644
index 00000000..e1778af7
--- /dev/null
+++ b/neo/portability/inttypes.h
@@ -0,0 +1,13 @@
+#pragma once
+
+#ifdef _MSV_VER
+
+#define PRIuSIZE "Iu"
+#define PRIxSIZE "Ix"
+
+#else // ifdef _MSV_VER
+
+#define PRIuSIZE "zu"
+#define PRIxSIZE "zx"
+
+#endif // ifdef _MSV_VER