diff --git a/drivers/net/usb/rtl8150.c b/drivers/net/usb/rtl8150.c
index b091e20ca1679d82544751a5aa39683b69d244ac..f14d225404da59c5b5ce84b6e3849663e799aca1 100644
--- a/drivers/net/usb/rtl8150.c
+++ b/drivers/net/usb/rtl8150.c
@@ -324,7 +324,7 @@ static int rtl8150_set_mac_address(struct net_device *netdev, void *p)
 		dbg("%02X:", netdev->dev_addr[i]);
 	dbg("%02X\n", netdev->dev_addr[i]);
 	/* Set the IDR registers. */
-	set_registers(dev, IDR, sizeof(netdev->dev_addr), netdev->dev_addr);
+	set_registers(dev, IDR, netdev->addr_len, netdev->dev_addr);
 #ifdef EEPROM_WRITE
 	{
 	u8 cr;