diff --git a/target/linux/generic-2.6/files-2.6.30/drivers/net/phy/mvswitch.c b/target/linux/generic-2.6/files-2.6.30/drivers/net/phy/mvswitch.c
index 7aed70d47f..77899e0827 100644
--- a/target/linux/generic-2.6/files-2.6.30/drivers/net/phy/mvswitch.c
+++ b/target/linux/generic-2.6/files-2.6.30/drivers/net/phy/mvswitch.c
@@ -248,6 +248,9 @@ mvswitch_config_init(struct phy_device *pdev)
 	pdev->advertising = ADVERTISED_100baseT_Full;
 	dev->phy_ptr = priv;
 	dev->irq = PHY_POLL;
+#ifdef HEADER_MODE
+	dev->flags |= IFF_PROMISC;
+#endif
 
 	/* initialize default vlans */
 	for (i = 0; i < MV_PORTS; i++)