diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
index 4ea226566cec94e324fa565a979c51d6a88d8b11..c9ecf3c8c3fd525f963ed08febcf024e4145fa9a 100644
--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c
@@ -429,7 +429,7 @@ static int m88e1101_config_aneg(struct phy_device *phydev)
 	return marvell_config_aneg(phydev);
 }
 
-#ifdef CONFIG_OF_MDIO
+#if IS_ENABLED(CONFIG_OF_MDIO)
 /* Set and/or override some configuration registers based on the
  * marvell,reg-init property stored in the of_node for the phydev.
  *