diff --git a/ChangeLog b/ChangeLog
index 9396ee8..6008450 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2017-12-17  Henry Bent  <henry.r.bent@gmail.com>
+
+	* config.guess (mips:OSF1:*:*): Recognise.
+	* testsuite/config-guess.data: Add a test case.
+
 2017-11-23  Olivier Hainque  <hainque@adacore.com>
 
 	* config.sub: Map -pikeos to baremetal.
diff --git a/config.guess b/config.guess
index 31e01ef..770cb5c 100755
--- a/config.guess
+++ b/config.guess
@@ -2,7 +2,7 @@
 # Attempt to guess a canonical system name.
 #   Copyright 1992-2017 Free Software Foundation, Inc.
 
-timestamp='2017-11-07'
+timestamp='2017-12-17'
 
 # 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
@@ -265,6 +265,9 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
     *:Redox:*:*)
 	echo ${UNAME_MACHINE}-unknown-redox
 	exit ;;
+    mips:OSF1:*.*)
+        echo mips-dec-osf1
+        exit ;;
     alpha:OSF1:*:*)
 	case $UNAME_RELEASE in
 	*4.0)
diff --git a/testsuite/config-guess.data b/testsuite/config-guess.data
index 186af24..a11accb 100644
--- a/testsuite/config-guess.data
+++ b/testsuite/config-guess.data
@@ -52,6 +52,7 @@ i86xen		 5.0			 AuroraUX		 ignored	 ignored	 i386-pc-auroraux5.0
 IA64		 6.0			 Interix		 ignored	 ignored	 ia64-unknown-interix6.0
 k1om		 2.6.38			 Linux			 ignored	 ignored	 k1om-unknown-linux-gnu
 macppc		 1.0			 MirBSD			 ignored	 ignored	 powerpc-unknown-mirbsd1.0
+mips		 1.0			 OSF1			 ignored	 ignored	 mips-dec-osf1
 mips64el	 2.6.2			 Linux			 ignored	 ignored	 mips64el-unknown-linux-gnu
 NEO-1		 1.0			 NONSTOP_KERNEL		 ignored	 ignored	 neo-tandem-nsk1.0
 NEO-12		 1.0			 NONSTOP_KERNEL		 ignored	 ignored	 neo-tandem-nsk1.0