diff --git a/ChangeLog b/ChangeLog
index 6694150..785eb3b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2018-01-13  Ben Elliston  <bje@gnu.org>
+
+	* config.sub (maybe_os): Remove duplicate case for z8k.
+
 2018-01-13  Ben Elliston  <bje@gnu.org>
 
 	* config.sub (maybe_os): Remove duplicate case for sh.
diff --git a/config.sub b/config.sub
index 578657d..622d9ea 100755
--- a/config.sub
+++ b/config.sub
@@ -333,7 +333,7 @@ case $basic_machine in
 		basic_machine=$basic_machine-unknown
 		os=-none
 		;;
-	m88110 | m680[12346]0 | m683?2 | m68360 | m5200 | v70 | w65 | z8k)
+	m88110 | m680[12346]0 | m683?2 | m68360 | m5200 | v70 | w65)
 		;;
 	ms1)
 		basic_machine=mt-unknown