diff --git a/ChangeLog b/ChangeLog
index 48e9fc0..e25469c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2018-01-14  Ben Elliston  <bje@gnu.org>
+
+	* config.sub (maybe_os): Remove duplicated pattern -opened* which
+	prevents the more specific case matching on line 1427.
+	* testsuite/config-sub.data: Add a test.
+
 2018-01-14  Ben Elliston  <bje@gnu.org>
 
 	* config.sub (maybe_os): Remove first and duplicate -none*
diff --git a/config.sub b/config.sub
index 8a81a07..a8d1dfd 100755
--- a/config.sub
+++ b/config.sub
@@ -2,7 +2,7 @@
 # Configuration validation subroutine script.
 #   Copyright 1992-2018 Free Software Foundation, Inc.
 
-timestamp='2018-01-13'
+timestamp='2018-01-14'
 
 # 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
@@ -1381,7 +1381,7 @@ case $os in
 	      | -midipix* | -mingw32* | -mingw64* | -linux-gnu* | -linux-android* \
 	      | -linux-newlib* | -linux-musl* | -linux-uclibc* \
 	      | -uxpv* | -beos* | -mpeix* | -udk* | -moxiebox* \
-	      | -interix* | -uwin* | -mks* | -rhapsody* | -darwin* | -opened* \
+	      | -interix* | -uwin* | -mks* | -rhapsody* | -darwin* \
 	      | -openstep* | -oskit* | -conix* | -pw32* | -nonstopux* \
 	      | -storm-chaos* | -tops10* | -tenex* | -tops20* | -its* \
 	      | -os2* | -vos* | -palmos* | -uclinux* | -nucleus* \
diff --git a/testsuite/config-sub.data b/testsuite/config-sub.data
index 2a4c3bf..75c0c64 100644
--- a/testsuite/config-sub.data
+++ b/testsuite/config-sub.data
@@ -151,6 +151,7 @@ hppa64						hppa64-unknown-none
 hppa						hppa-unknown-none
 hppa-next					hppa-next-nextstep
 i370						i370-ibm-mvs
+i370-opened					i370-ibm-openedition
 i386-386bsd					i386-pc-bsd
 i386-aros					i386-pc-aros
 i386-bitrig					i386-pc-bitrig