Index: /trunk/source/cocoa-ide/cocoa-editor.lisp
===================================================================
--- /trunk/source/cocoa-ide/cocoa-editor.lisp	(revision 8453)
+++ /trunk/source/cocoa-ide/cocoa-editor.lisp	(revision 8454)
@@ -1714,6 +1714,6 @@
       (hemlock-buffer ts))))
 
-(objc:defmethod (#/undoManager :<BOOL>) ((self echo-area-document))
-  nil) ;For now, undo is not supported for echo-areas
+(objc:defmethod #/undoManager ((self echo-area-document))
+  +null-ptr+) ;For now, undo is not supported for echo-areas
 
 (defmethod update-buffer-package ((doc echo-area-document) buffer)