diff --git a/sys/dev/mii/mv88e151x.c b/sys/dev/mii/mv88e151x.c
--- a/sys/dev/mii/mv88e151x.c
+++ b/sys/dev/mii/mv88e151x.c
@@ -97,7 +97,7 @@
 {
 	const struct mii_attach_args *ma;
 	struct mii_softc *sc;
-	uint32_t cop_cap, cop_extcap;
+	uint32_t cop_cap = 0, cop_extcap = 0;
 
 	sc = device_get_softc(dev);
 	ma = device_get_ivars(dev);
@@ -224,10 +224,12 @@
 		else if (reg & MV88E151X_STATUS_LINK &&
 		    reg & MV88E151X_STATUS_SYNC &&
 		    (reg & MV88E151X_STATUS_ENERGY) == 0) {
-			if ((reg & MV88E151X_STATUS_SPEED_MASK) ==
+			if (((reg & MV88E151X_STATUS_SPEED_MASK) >>
+			    MV88E151X_STATUS_SPEED_SHIFT) ==
 			    MV88E151X_STATUS_SPEED_1000)
 				mii->mii_media_active |= IFM_1000_SX;
-			else if ((reg & MV88E151X_STATUS_SPEED_MASK) ==
+			else if (((reg & MV88E151X_STATUS_SPEED_MASK) >>
+			    MV88E151X_STATUS_SPEED_SHIFT) ==
 			    MV88E151X_STATUS_SPEED_100)
 				mii->mii_media_active |= IFM_100_FX;
 			else