diff --git a/include/wx/palmos/setup0.h b/include/wx/palmos/setup0.h
index 473729ea37..cc94bee626 100644
--- a/include/wx/palmos/setup0.h
+++ b/include/wx/palmos/setup0.h
@@ -598,6 +598,14 @@
 // Recommended setting: 1
 #define wxUSE_CHOICEBOOK 0
 
+// wxTreebook control is similar to wxNotebook but uses wxTreeCtrl instead of
+// the tabs
+//
+// Default is 1.
+//
+// Recommended setting: 1
+#define wxUSE_TREEBOOK 0
+
 // wxTabDialog is a generic version of wxNotebook but it is incompatible with
 // the new class. It shouldn't be used in new code.
 //