diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index 8ea004714648d335972f41e0d8f3f96515408bbc..25a094c44f39390d88666ecc73c6b4c518c0dce6 100644
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -1866,6 +1866,9 @@ static void eth_port_start(struct mv643xx_private *mp)
 	/* Enable port Rx. */
 	mv_write(MV643XX_ETH_RECEIVE_QUEUE_COMMAND_REG(port_num),
 						mp->port_rx_queue_command);
+
+	/* Disable port bandwidth limits by clearing MTU register */
+	mv_write(MV643XX_ETH_MAXIMUM_TRANSMIT_UNIT(port_num), 0);
 }
 
 /*