diff --git a/drivers/net/arcnet/arcnet.c b/drivers/net/arcnet/arcnet.c
index 75a5725609096..e29940d2b674c 100644
--- a/drivers/net/arcnet/arcnet.c
+++ b/drivers/net/arcnet/arcnet.c
@@ -1008,7 +1008,7 @@ static void arcnet_rx(struct net_device *dev, int bufnum)
 
 	soft = &pkt.soft.rfc1201;
 
-	lp->hw.copy_from_card(dev, bufnum, 0, &pkt, sizeof(ARC_HDR_SIZE));
+	lp->hw.copy_from_card(dev, bufnum, 0, &pkt, ARC_HDR_SIZE);
 	if (pkt.hard.offset[0]) {
 		ofs = pkt.hard.offset[0];
 		length = 256 - ofs;