diff --git a/gas/doc/none.m4 b/gas/doc/none.m4
index c15964662a..a16efa2f2b 100644
--- a/gas/doc/none.m4
+++ b/gas/doc/none.m4
@@ -29,6 +29,7 @@ _define__(<_I960__>,<0>)
 _define__(<_M680X0__>,<0>)
 _define__(<_SPARC__>,<0>)
 _define__(<_VAX__>,<0>)
+_define__(<_Z8000__>,<0>)
 _define__(<_VXWORKS__>,<0>)
 
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