diff --git a/include/Mw/TypeDefs.h b/include/Mw/TypeDefs.h
index db74060..e4dc2f4 100644
--- a/include/Mw/TypeDefs.h
+++ b/include/Mw/TypeDefs.h
@@ -39,10 +39,23 @@ typedef void (*MwErrorHandler)(int code, const char* message, void* user_data);
 
 #if __STDC_VERSION__ >= 199901L
 typedef unsigned long long MwOffset;
+
+#define MwOffsetPrint "%llu"
 #elif defined(_MSC_VER) || defined(__BORLANDC__) || defined(__WATCOMC__)
 typedef unsigned __int64 MwOffset;
+
+#if defined(_MSC_VER)
+#define MwOffsetPrint "%I64u"
+#elif defined(__BORLANDC__)
+#define MwOffsetPrint "%I64llu"
+#elif defined(__WATCOMC__)
+#define MwOffsetPrint "%llu"
+#endif
+
 #elif
 typedef unsigned long MwOffset; /* out of hope */
+
+#define MwOffsetPrint "%lu"
 #endif
 
 #include <Mw/LowLevel.h>