diff --git a/interface/wx/defs.h b/interface/wx/defs.h
index 3e8f936398..05fb242bff 100644
--- a/interface/wx/defs.h
+++ b/interface/wx/defs.h
@@ -854,6 +854,7 @@ enum wxDataFormatId
     wxDF_LOCALE =           16,
     wxDF_PRIVATE =          20,
     wxDF_HTML =             30, /* Note: does not correspond to CF_ constant */
+    wxDF_PNG =              31, /* Note: does not correspond to CF_ constant */
     wxDF_MAX
 };