diff --git a/include/Makefile b/include/Makefile
index 61f21fb5a077..84cba1dfc49b 100644
--- a/include/Makefile
+++ b/include/Makefile
@@ -117,6 +117,11 @@ copies:
 		${INSTALL} -C -o ${BINOWN} -g ${BINGRP} -m 444 *.h \
 		${DESTDIR}/usr/include/netinet
 .endif
+.if exists(${.CURDIR}/../sys/${MACHINE_ARCH}/include)
+	cd ${.CURDIR}/../sys/${MACHINE_ARCH}/include; \
+		${INSTALL} -C -o ${BINOWN} -g ${BINGRP} -m 444 *.h \
+		${DESTDIR}/usr/include/machine
+.endif
 .for i in ${SFILES}
 	ln -sf ../sys/$i ${DESTDIR}/usr/include/machine/$i
 .endfor