diff --git a/sys/modules/mgb/Makefile b/sys/modules/mgb/Makefile
index 3b819239ef0e..74b5c058a762 100644
--- a/sys/modules/mgb/Makefile
+++ b/sys/modules/mgb/Makefile
@@ -1,14 +1,14 @@
 # $FreeBSD$
 
 .PATH:	${SRCTOP}/sys/dev/mgb
 
 KMOD	= if_mgb
 SRCS	= if_mgb.c
 SRCS	+= device_if.h bus_if.h pci_if.h
-SRCS	+= ifdi_if.h
+SRCS	+= ifdi_if.h opt_platform.h
 SRCS	+= miibus_if.h
 
 #CFLAGS+= -DIFLIB
 
 .include <bsd.kmod.mk>