diff --git a/src/device/device_const.c b/src/device/device_const.c
index a40d0b0..a63a629 100644
--- a/src/device/device_const.c
+++ b/src/device/device_const.c
@@ -147,6 +147,10 @@
 	case DEVICE_PATH_GPIO:
 		equal = (path1->gpio.id == path2->gpio.id);
 		break;
+	case DEVICE_PATH_MDIO:
+		equal = (path1->mdio.addr == path2->mdio.addr);
+		break;
+
 	default:
 		printk(BIOS_ERR, "Unknown device type: %d\n", path1->type);
 		break;