diff --git a/drivers/phy/phy-miphy365x.c b/drivers/phy/phy-miphy365x.c
index e111baf187ce2..e0fb7a1e5a5a9 100644
--- a/drivers/phy/phy-miphy365x.c
+++ b/drivers/phy/phy-miphy365x.c
@@ -163,6 +163,7 @@ enum miphy_sata_gen {
 };
 
 static u8 rx_tx_spd[] = {
+	0, /* GEN0 doesn't exist. */
 	TX_SPDSEL_GEN1_VAL | RX_SPDSEL_GEN1_VAL,
 	TX_SPDSEL_GEN2_VAL | RX_SPDSEL_GEN2_VAL,
 	TX_SPDSEL_GEN3_VAL | RX_SPDSEL_GEN3_VAL