diff --git a/sys/modules/sio/Makefile b/sys/modules/sio/Makefile
new file mode 100644
index 000000000000..5feb9025c685
--- /dev/null
+++ b/sys/modules/sio/Makefile
@@ -0,0 +1,25 @@
+# $FreeBSD$
+
+.PATH: ${.CURDIR}/../../dev/sio
+
+KMOD=	sio
+SRCS=	sio.c sio_pccard.c sio_pci.c sio_puc.c
+
+.if ${MACHINE} == "sparc64"
+### untested
+CFLAGS += sio_ebus.c
+.endif
+.if ${MACHINE} == "pc98"
+CFLAGS+= -DPC98
+.else
+SRCS+=	sio_isa.c
+.endif
+
+opt_compat.h:
+	@echo '#define COMPAT_43 1' > opt_compat.h
+	@echo '#define COMPAT_FREEBSD4 1' >> opt_compat.h
+
+SRCS+=	opt_sio.h opt_ddb.h opt_compat.h opt_comconsole.h \
+	bus_if.h card_if.h device_if.h isa_if.h pci_if.h
+
+.include <bsd.kmod.mk>