diff --git a/etg/cshelp.py b/etg/cshelp.py
index 919fa71d..b3d6030d 100644
--- a/etg/cshelp.py
+++ b/etg/cshelp.py
@@ -44,6 +44,10 @@ def run():
     c.abstract = True
     c.find('Set').transferBack = True
     c.find('Set.helpProvider').transfer = True
+    c.find('AddHelp.window').type = 'wxWindowBase *'
+    c.find('RemoveHelp.window').type = 'wxWindowBase *'
+    c.find('ShowHelp.window').type = 'wxWindowBase *'
+    c.find('ShowHelpAtPoint.window').type = 'wxWindowBase *'
     c.mustHaveApp()