diff --git a/include/wx/longlong.h b/include/wx/longlong.h
index 83d32a77fb..468d826636 100644
--- a/include/wx/longlong.h
+++ b/include/wx/longlong.h
@@ -60,7 +60,7 @@
 #elif defined(__BORLANDC__) && defined(__WIN32__) && (__BORLANDC__ >= 0x520)
     #define wxLongLong_t __int64
     #define wxLongLongSuffix i64
-    #define wxLongLongFmtSpec _T("I64")
+    #define wxLongLongFmtSpec _T("Ld")
 #elif (defined(SIZEOF_LONG_LONG) && SIZEOF_LONG_LONG >= 8)  || \
         defined(__MINGW32__) || \
         defined(__GNUC__) || \