diff --git a/ChangeLog b/ChangeLog
index 0eb46cb..113008f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2014-11-04  Ben Elliston  <bje@gnu.org>
+
+	* config.guess (*:AIX:*:[4567]): Use /usr/biun/lslpp and not
+	oslevel to determine the OS version number. This gives more a
+	precise version number.	From Michael Felt.
+
 2014-09-26  Olivier Hainque  <hainque@adacore.com>
 
 	* config.sub (leon, leon[3-9]): New CPUs.
diff --git a/config.guess b/config.guess
index 4c185ba..6c32c86 100755
--- a/config.guess
+++ b/config.guess
@@ -2,7 +2,7 @@
 # Attempt to guess a canonical system name.
 #   Copyright 1992-2014 Free Software Foundation, Inc.
 
-timestamp='2014-03-23'
+timestamp='2014-11-04'
 
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
@@ -579,8 +579,9 @@ EOF
 	else
 		IBM_ARCH=powerpc
 	fi
-	if [ -x /usr/bin/oslevel ] ; then
-		IBM_REV=`/usr/bin/oslevel`
+	if [ -x /usr/bin/lslpp ] ; then
+		IBM_REV=`/usr/bin/lslpp -Lqc bos.rte.libc |
+			   awk -F: '{ print $3 }' | sed s/[0-9]*$/0/`
 	else
 		IBM_REV=${UNAME_VERSION}.${UNAME_RELEASE}
 	fi