diff --git a/share/mk/bsd.mkopt.mk b/share/mk/bsd.mkopt.mk
index f0d9add7547..52123d066bf 100644
--- a/share/mk/bsd.mkopt.mk
+++ b/share/mk/bsd.mkopt.mk
@@ -63,6 +63,15 @@ MK_${var}:=	no
 .endfor
 .undef __DEFAULT_NO_OPTIONS
 
+#
+# MK_* options which are always no, usually because they are
+# unsupported/badly broken on this architecture.
+#
+.for var in ${__ALWAYS_NO_OPTIONS}
+MK_${var}:=	no
+.endfor
+.undef __ALWAYS_NO_OPTIONS
+
 #
 # MK_* options which are always no, usually because they are
 # unsupported/badly broken on this architecture.
diff --git a/sys/conf/kern.opts.mk b/sys/conf/kern.opts.mk
index 02ca4cc71bd..e0f961c378f 100644
--- a/sys/conf/kern.opts.mk
+++ b/sys/conf/kern.opts.mk
@@ -119,6 +119,16 @@ MK_${var}:=	no
 .undef BROKEN_OPTIONS
 #end of bsd.mkopt.mk expanded inline.
 
+#
+# MK_* options which are always no, usually because they are
+# unsupported/badly broken on this architecture.
+#
+.for var in ${__ALWAYS_NO_OPTIONS}
+MK_${var}:=	no
+.endfor
+.undef __ALWAYS_NO_OPTIONS
+#end of bsd.mkopt.mk expanded inline.
+
 #
 # MK_*_SUPPORT options which default to "yes" unless their corresponding
 # MK_* variable is set to "no".