diff --git a/include/wx/stream.h b/include/wx/stream.h
index b2a889a9bf..692d522305 100644
--- a/include/wx/stream.h
+++ b/include/wx/stream.h
@@ -20,6 +20,10 @@
 #include <wx/object.h>
 #include <wx/string.h>
 
+#ifdef    _MSC_VER
+  #define   off_t       _off_t
+#endif
+
 /*
  * wxStream: base classes
  */