diff --git a/sys/dev/mwl/if_mwlvar.h b/sys/dev/mwl/if_mwlvar.h
index 4a4b338239e5..2792b9c9db99 100644
--- a/sys/dev/mwl/if_mwlvar.h
+++ b/sys/dev/mwl/if_mwlvar.h
@@ -37,6 +37,7 @@
 #define _DEV_MWL_MVVAR_H
 
 #include <sys/endian.h>
+#include <sys/bus.h>
 #include <net80211/ieee80211_radiotap.h>
 #include <dev/mwl/mwlhal.h>
 #include <dev/mwl/mwlreg.h>
diff --git a/sys/dev/mwl/mwlhal.h b/sys/dev/mwl/mwlhal.h
index 25b8b07c48d9..087effa5a722 100644
--- a/sys/dev/mwl/mwlhal.h
+++ b/sys/dev/mwl/mwlhal.h
@@ -71,15 +71,13 @@ enum {
 	MWL_WME_AC_VO	= 3,		/* voice access category */
 };
 
-struct device;
-
 struct mwl_hal {
 	bus_space_handle_t mh_ioh;	/* BAR 1 copied from softc */
 	bus_space_tag_t	mh_iot;
 	uint32_t	mh_imask;	/* interrupt mask */
 	/* remainder is opaque to driver */
 };
-struct mwl_hal *mwl_hal_attach(struct device *dev, uint16_t devid,
+struct mwl_hal *mwl_hal_attach(device_t dev, uint16_t devid,
     bus_space_handle_t ioh, bus_space_tag_t iot, bus_dma_tag_t tag);
 void	mwl_hal_detach(struct mwl_hal *);