diff --git a/sys/dev/usb/net/if_mos.c b/sys/dev/usb/net/if_mos.c
index 3a65ec6207b..e6aaac95cc7 100644
--- a/sys/dev/usb/net/if_mos.c
+++ b/sys/dev/usb/net/if_mos.c
@@ -418,7 +418,7 @@ mos_write_mcast(struct mos_softc *sc, u_char *hashtbl)
 }
 
 static int
-mos_miibus_readreg(struct device *dev, int phy, int reg)
+mos_miibus_readreg(device_t dev, int phy, int reg)
 {
 	struct mos_softc *sc = device_get_softc(dev);
 	uWord val;