diff --git a/usr.bin/kdump/Makefile b/usr.bin/kdump/Makefile
index ea2a604b196e..0af84ccb42d4 100644
--- a/usr.bin/kdump/Makefile
+++ b/usr.bin/kdump/Makefile
@@ -21,7 +21,8 @@ NO_WERROR?=	YES
 CLEANFILES=	ioctl.c kdump_subr.c kdump_subr.h linux_syscalls.c
 
 ioctl.c: mkioctls
-	sh ${.CURDIR}/mkioctls ${DESTDIR}/usr/include > ${.TARGET}
+	env MACHINE=${MACHINE} \
+	    sh ${.CURDIR}/mkioctls ${DESTDIR}/usr/include > ${.TARGET}
 
 kdump_subr.h: mksubr
 	sh ${.CURDIR}/mksubr ${DESTDIR}/usr/include | \
diff --git a/usr.bin/kdump/mkioctls b/usr.bin/kdump/mkioctls
index 33107dfe711e..7ef2865b26e8 100644
--- a/usr.bin/kdump/mkioctls
+++ b/usr.bin/kdump/mkioctls
@@ -13,15 +13,16 @@ LC_ALL=C; export LC_ALL
 
 # Build a list of headers that have ioctls in them.
 # XXX should we use an ANSI cpp?
-ioctl_includes=`
+ioctl_includes=$(
 	cd $1
 	find -H -s * -name '*.h' | grep -v '.*disk.*\.h' | \
 		xargs egrep -l \
 '^#[ 	]*define[ 	]+[A-Za-z_][A-Za-z0-9_]*[ 	]+_IO[^a-z0-9_]' |
-		awk '{printf("#include <%s>\\\\n", $1)}'
-`
+		awk '{printf("#include <%s>\\n", $1)}'
+)
 
-case "`uname -m`" in
+: ${MACHINE=$(uname -m)}
+case "${MACHINE}" in
 *pc98*)
 	ioctl_includes="$ioctl_includes#include <sys/diskpc98.h>\\n"
 	;;