diff --git a/include/linux/of_mdio.h b/include/linux/of_mdio.h
index 6ef49b8..00f336f 100644
--- a/include/linux/of_mdio.h
+++ b/include/linux/of_mdio.h
@@ -26,17 +26,17 @@ extern struct phy_device *of_phy_connect_fixed_link(struct net_device *dev,
 extern struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np);
 
 #else /* CONFIG_OF */
-int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
+static int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
 {
 	return -ENOSYS;
 }
 
-struct phy_device *of_phy_find_device(struct device_node *phy_np)
+static struct phy_device *of_phy_find_device(struct device_node *phy_np)
 {
 	return NULL;
 }
 
-struct phy_device *of_phy_connect(struct net_device *dev,
+static struct phy_device *of_phy_connect(struct net_device *dev,
 					 struct device_node *phy_np,
 					 void (*hndlr)(struct net_device *),
 					 u32 flags, phy_interface_t iface)
@@ -44,14 +44,14 @@ struct phy_device *of_phy_connect(struct net_device *dev,
 	return NULL;
 }
 
-struct phy_device *of_phy_connect_fixed_link(struct net_device *dev,
+static struct phy_device *of_phy_connect_fixed_link(struct net_device *dev,
 					 void (*hndlr)(struct net_device *),
 					 phy_interface_t iface)
 {
 	return NULL;
 }
 
-struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np)
+static struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np)
 {
 	return NULL;
 }