diff --git a/include/wx/strconv.h b/include/wx/strconv.h
index 5d93e872ce..72423f8c77 100644
--- a/include/wx/strconv.h
+++ b/include/wx/strconv.h
@@ -210,7 +210,12 @@ private:
     bool m_deferred;
 };
 
+#ifdef __WXOSX__
+#define wxConvFile wxConvUTF8
+#else
 #define wxConvFile wxConvLocal
+#endif
+
 WXDLLIMPEXP_DATA_BASE(extern wxCSConv&) wxConvLocal;
 WXDLLIMPEXP_DATA_BASE(extern wxCSConv&) wxConvISO8859_1;
 WXDLLIMPEXP_DATA_BASE(extern wxMBConv *) wxConvCurrent;
@@ -241,8 +246,12 @@ WXDLLIMPEXP_DATA_BASE(extern wxMBConv *) wxConvCurrent;
 #if wxMBFILES && wxUSE_UNICODE
     #define wxFNCONV(name) wxConvFile.cWX2MB(name)
     #define wxFNSTRINGCAST wxMBSTRINGCAST
+#else
+#if defined( __WXOSX__ ) && wxMBFILES
+    #define wxFNCONV(name) wxConvFile.cWC2MB( wxConvLocal.cWX2WC(name) )
 #else
     #define wxFNCONV(name) name
+#endif
     #define wxFNSTRINGCAST WXSTRINGCAST
 #endif
 
diff --git a/include/wx/string.h b/include/wx/string.h
index db9a54b8b3..bdd38c93a1 100644
--- a/include/wx/string.h
+++ b/include/wx/string.h
@@ -830,8 +830,11 @@ public:
 #if wxUSE_WCHAR_T
     const wxWCharBuffer wc_str(wxMBConv& conv) const;
 #endif // wxUSE_WCHAR_T
-
+#ifdef __WXOSX__
+    const wxCharBuffer fn_str() const { return wxConvFile.cWC2WX( wc_str( wxConvLocal ) ); }
+#else
     const wxChar* fn_str() const { return c_str(); }
+#endif
 #endif // Unicode/ANSI
 
   // overloaded assignment