diff --git a/configure.ac b/configure.ac
index 2149f5a..ffa94e86 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-# $Id: configure.ac,v 1.310 2005/11/25 02:14:58 dtucker Exp $
+# $Id: configure.ac,v 1.311 2005/11/26 11:24:10 dtucker Exp $
 #
 # Copyright (c) 1999-2004 Damien Miller
 #
@@ -181,6 +181,8 @@
 	AC_DEFINE(SPT_TYPE,SPT_REUSEARGV,
 		[Define to a Set Process Title type if your system is
 		supported by bsd-setproctitle.c])
+	AC_DEFINE(SSHPAM_CHAUTHTOK_NEEDS_RUID, 1,
+	    [AIX 5.2 and 5.3 (and presumably newer) require this])
 	;;
 *-*-cygwin*)
 	check_for_libcrypt_later=1