diff --git a/tests/streams/fileback.cpp b/tests/streams/fileback.cpp
index 7a83aa13e1..c8f6325050 100644
--- a/tests/streams/fileback.cpp
+++ b/tests/streams/fileback.cpp
@@ -19,13 +19,14 @@
 #endif
 
 
+#ifdef __VISUALC6__
 // need this to be able to use CPPUNIT_ASSERT_EQUAL with wxFileOffset objects
 static std::ostream& operator<<(std::ostream& ostr, const wxFileOffset& fo)
 {
     ostr << fo;
     return ostr;
 }
-
+#endif // VC++ 6
 
 #include "wx/mstream.h"
 #include "wx/private/fileback.h"