diff --git a/include/wx/defs.h b/include/wx/defs.h
index 05cc3427cb..0c9d550056 100644
--- a/include/wx/defs.h
+++ b/include/wx/defs.h
@@ -2246,7 +2246,7 @@ enum wxUpdateUI
 #   define wxALL_FILES           gettext_noop("All files (*)|*")
 #endif
 
-#if defined(__CYGWIN__)
+#if defined(__CYGWIN__) && defined(__WXMSW__)
 #   if wxUSE_STL || defined(wxUSE_STD_STRING)
          //NASTY HACK because the gethostname in sys/unistd.h which the gnu stl includes
          //and wx builds with by default clash with each other (windows version