diff --git a/include/wx/longlong.h b/include/wx/longlong.h
index c39828d061..2731af5ae5 100644
--- a/include/wx/longlong.h
+++ b/include/wx/longlong.h
@@ -39,7 +39,7 @@
 #if defined(SIZEOF_LONG) && (SIZEOF_LONG == 8)
     #define wxLongLong_t long
     #define wxLongLongIsLong
-#elif defined(__VISUALC__)
+#elif defined(__VISUALC__) || defined( __VMS__ )
     #define wxLongLong_t __int64
 #elif defined(__GNUG__)
     #define wxLongLong_t long long