diff --git a/include/wx/gtk/mimetype.h b/include/wx/gtk/mimetype.h
index 9d08613aa3..fe424e4230 100644
--- a/include/wx/gtk/mimetype.h
+++ b/include/wx/gtk/mimetype.h
@@ -23,7 +23,11 @@
 class WXDLLIMPEXP_CORE wxGTKMimeTypesManagerImpl : public wxMimeTypesManagerImpl
 {
 protected:
+#if defined(__UNIX__)
     wxString GetIconFromMimeType(const wxString& mime) wxOVERRIDE;
+#else
+    wxString GetIconFromMimeType(const wxString& mime);
+#endif
 };