diff --git a/drivers/net/miiphy.c b/drivers/net/miiphy.c
index 5fe7dc8..126d0b8 100644
--- a/drivers/net/miiphy.c
+++ b/drivers/net/miiphy.c
@@ -58,7 +58,9 @@
 		/*
 		 * Set the auto-negotiation advertisement register bits
 		 */
-		mdev->write(mdev, mdev->address, MII_ADVERTISE, ADVERTISE_ALL);
+		mdev->read(mdev, mdev->address, MII_ADVERTISE, &status);
+		status |= ADVERTISE_ALL;
+		mdev->write(mdev, mdev->address, MII_ADVERTISE, status);
 
 		mdev->write(mdev, mdev->address, MII_BMCR, BMCR_ANENABLE | BMCR_ANRESTART);
 	}