diff --git a/wxPython/src/_defs.i b/wxPython/src/_defs.i
index 9a7704d505..1e1dfc9fb2 100644
--- a/wxPython/src/_defs.i
+++ b/wxPython/src/_defs.i
@@ -490,6 +490,8 @@ enum {
     wxCLIP_CHILDREN,
     wxCLIP_SIBLINGS,
 
+    wxWINDOW_STYLE_MASK,
+    
     wxALWAYS_SHOW_SB,
     
     wxRETAINED,