diff --git a/compiler/generic/vm-fndb.lisp b/compiler/generic/vm-fndb.lisp
index bbd2f8eec19d8f036aec160fd3d94d7184091b62..3b0c8aa4341dbb092830836a2668625ce777a350 100644
--- a/compiler/generic/vm-fndb.lisp
+++ b/compiler/generic/vm-fndb.lisp
@@ -7,11 +7,11 @@
 ;;; 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 1.39 1991/07/22 19:22:34 wlott Exp $")
+  "$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/compiler/generic/vm-fndb.lisp,v 1.40 1991/08/01 10:44:03 wlott Exp $")
 ;;;
 ;;; **********************************************************************
 ;;;
-;;; $Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/compiler/generic/vm-fndb.lisp,v 1.39 1991/07/22 19:22:34 wlott Exp $
+;;; $Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/compiler/generic/vm-fndb.lisp,v 1.40 1991/08/01 10:44:03 wlott Exp $
 ;;;
 ;;; This file defines the machine specific function signatures.
 ;;;
@@ -35,7 +35,9 @@
 	  32bit-logical-or 32bit-logical-nor
 	  32bit-logical-xor 32bit-logical-eqv
 	  32bit-logical-andc1 32bit-logical-andc2
-	  32bit-logical-orc1 32bit-logical-orc2))
+	  32bit-logical-orc1 32bit-logical-orc2
+
+	  mutator-self))
 
 (in-package "C")
 
@@ -265,6 +267,12 @@
 (defknown code-header-set (t index t) t ())
 
 
+
+;;;; Mutator accessors.
+
+(defknown mutator-self () system-area-pointer (flushable movable))
+
+
 
 ;;;; Automatic defknowns for primitive objects.