diff --git a/drivers/net/usb/sr9700.c b/drivers/net/usb/sr9700.c
index 9c7cd0db1768..446857de8e15 100644
--- a/drivers/net/usb/sr9700.c
+++ b/drivers/net/usb/sr9700.c
@@ -271,7 +271,7 @@ static int sr9700_set_mac_address(struct net_device *netdev, void *p)
 	}
 
 	eth_hw_addr_set(netdev, addr->sa_data);
-	sr_write_async(dev, SR_PAR, 6, netdev->dev_addr);
+	sr_write_async(dev, SR_PAR, ETH_ALEN, netdev->dev_addr);
 
 	return 0;
 }