diff --git a/sys/modules/cam/Makefile b/sys/modules/cam/Makefile
index f1bfdb94d31..35b36d84a65 100644
--- a/sys/modules/cam/Makefile
+++ b/sys/modules/cam/Makefile
@@ -16,8 +16,11 @@ SRCS+=	opt_pt.h
 SRCS+=	opt_sa.h
 SRCS+=	opt_ses.h
 SRCS+=	device_if.h bus_if.h vnode_if.h
-SRCS+=	cam.c cam_periph.c cam_queue.c
-SRCS+=	cam_sim.c cam_xpt.c
+SRCS+=	cam.c
+.if exists($S/${MACHINE}/${MACHINE}/cam_machdep.c)
+SRCS+=	cam_machdep.c
+.endif
+SRCS+=	cam_periph.c cam_queue.c cam_sim.c cam_xpt.c
 SRCS+=	scsi_all.c scsi_cd.c scsi_ch.c
 SRCS+=	scsi_da.c
 SRCS+=	scsi_pass.c
@@ -32,7 +35,7 @@ SRCS+=	ata_all.c
 SRCS+=	ata_xpt.c
 SRCS+=	ata_da.c
 .if exists($S/${MACHINE}/${MACHINE}/ata_machdep.c)
-SRCS+=  ata_machdep.c
+SRCS+=	ata_machdep.c
 .endif
 SRCS+=	ata_pmp.c