diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index f45331ed90b01917ae8f256a8ae14b422e8f8bf8..586642c33d2b423dd9b0eaf7f9ff2ccf30b41900 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -1202,7 +1202,7 @@ static void sh_mdc_ctrl(struct mdiobb_ctrl *ctrl, int bit)
 }
 
 /* mdio bus control struct */
-static struct mdiobb_ops bb_ops = {
+static const struct mdiobb_ops bb_ops = {
 	.owner = THIS_MODULE,
 	.set_mdc = sh_mdc_ctrl,
 	.set_mdio_dir = sh_mmd_ctrl,