diff --git a/compiler/generic/vm-fndb.lisp b/compiler/generic/vm-fndb.lisp
index 613d61b138a5e0251bb953e6736cd557188b7516..6ab7203d208d6e302f9f25e071a804287ff3f35f 100644
--- a/compiler/generic/vm-fndb.lisp
+++ b/compiler/generic/vm-fndb.lisp
@@ -7,7 +7,7 @@
 ;;; Scott Fahlman or slisp-group@cs.cmu.edu.
 ;;;
 (ext:file-comment
-  "$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/compiler/generic/vm-fndb.lisp,v 1.47.1.1 1993/01/14 21:02:46 ram Exp $")
+  "$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/compiler/generic/vm-fndb.lisp,v 1.47.1.2 1993/02/08 22:19:04 ram Exp $")
 ;;;
 ;;; **********************************************************************
 ;;;
@@ -93,13 +93,15 @@
   (unsafe))
 (defknown %instance-layout (instance) layout
   (foldable flushable))
+(defknown %set-instance-layout (instance layout) layout
+  (unsafe))
 (defknown %instance-length (instance) instance-index
   (foldable flushable))
 (defknown %instance-ref (instance instance-index) t
   (flushable))
-(defknown (setf %instance-ref) (t instance instance-index) t
+(defknown %instance-set (instance instance-index t) t
   (unsafe))
-
+(defknown %layout-invalid-error (t layout) nil)
 
 (defknown %raw-ref-single (t index) single-float
   (foldable flushable))