diff --git a/tests/streams/fileback.cpp b/tests/streams/fileback.cpp
index 07e11c7900..8733b67ba7 100644
--- a/tests/streams/fileback.cpp
+++ b/tests/streams/fileback.cpp
@@ -19,16 +19,6 @@
 #endif
 
 
-#ifdef __VISUALC6__
-// there is no support for int64 output in VC6 stream classes so output it as
-// long which should work as long as we don't use >2GB files in this test...
-static std::ostream& operator<<(std::ostream& ostr, const wxFileOffset& fo)
-{
-    ostr << (long)fo;
-    return ostr;
-}
-#endif // __VISUALC6__
-
 #include "wx/mstream.h"
 #include "wx/private/fileback.h"
 #include "bstream.h"
@@ -184,21 +174,21 @@ void backStream::Read(wxInputStream& in,
 
 void backStream::Len(wxBackedInputStream& in)
 {
-    CPPUNIT_ASSERT_EQUAL(wxFileOffset(TESTSIZE), in.FindLength());
+    CPPUNIT_ASSERT_EQUAL(TESTSIZE, size_t(in.FindLength()));
 }
 
 void backStream::Seek(wxInputStream& in)
 {
-    CPPUNIT_ASSERT_EQUAL(wxFileOffset(TESTSIZE), in.SeekI(TESTSIZE));
+    CPPUNIT_ASSERT_EQUAL(TESTSIZE, size_t(in.SeekI(TESTSIZE)));
     in.GetC();
-    CPPUNIT_ASSERT_EQUAL(size_t(0), in.LastRead());
+    CPPUNIT_ASSERT_EQUAL(size_t(0), size_t(in.LastRead()));
     CPPUNIT_ASSERT(in.Eof());
 
-    for (wxFileOffset i = TESTSIZE - 1; i >= 0; i--) {
-        CPPUNIT_ASSERT_EQUAL(i, in.SeekI(i));
-        CPPUNIT_ASSERT_EQUAL(i, in.TellI());
-        CPPUNIT_ASSERT_EQUAL(int(i), in.GetC());
-        CPPUNIT_ASSERT_EQUAL(size_t(1), in.LastRead());
+    for (size_t i = TESTSIZE; i > 0; i--) {
+        CPPUNIT_ASSERT_EQUAL(i - 1, size_t(in.SeekI(i)));
+        CPPUNIT_ASSERT_EQUAL(i - 1, size_t(in.TellI()));
+        CPPUNIT_ASSERT_EQUAL(int(i - 1), in.GetC());
+        CPPUNIT_ASSERT_EQUAL(size_t(1), size_t(in.LastRead()));
         CPPUNIT_ASSERT(in.IsOk());
     }
 }