diff --git a/code/irrat.lisp b/code/irrat.lisp
index ac500bc1f511e551ccd91b066bdc48c18b799465..4c5658c1d89a8b9da50fad38e82b09d4cf911c98 100644
--- a/code/irrat.lisp
+++ b/code/irrat.lisp
@@ -5,7 +5,7 @@
 ;;; Carnegie Mellon University, and has been placed in the public domain.
 ;;;
 (ext:file-comment
-  "$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/code/irrat.lisp,v 1.43 2005/10/20 12:32:08 rtoy Exp $")
+  "$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/code/irrat.lisp,v 1.44 2006/05/03 19:39:56 rtoy Exp $")
 ;;;
 ;;; **********************************************************************
 ;;;
@@ -154,6 +154,17 @@
     (%log1p x))
   ) ; progn
 
+
+;; As above for x86.  It also seems to be needed to handle
+;; constant-folding in the compiler.
+#+sparc
+(progn
+  (defun %sqrt (x)
+    (declare (double-float x)
+	     (values double-float))
+    (%sqrt x))
+  )
+
 
 ;;;; Power functions.