diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index d4a64dbde31573329c87e25587e42ff3a6c603ae..88fa0779e0bc9278502ca8b0d84c55fded3020d4 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -432,7 +432,7 @@ int ksz_switch_register(struct ksz_device *dev,
 				if (of_property_read_u32(port, "reg",
 							 &port_num))
 					continue;
-				if (port_num >= dev->port_cnt)
+				if (port_num >= dev->mib_port_cnt)
 					return -EINVAL;
 				of_get_phy_mode(port,
 						&dev->ports[port_num].interface);