diff --git a/libc/kernel/uapi/linux/mdio.h b/libc/kernel/uapi/linux/mdio.h
index a38cbfc..4587aa2 100644
--- a/libc/kernel/uapi/linux/mdio.h
+++ b/libc/kernel/uapi/linux/mdio.h
@@ -104,6 +104,8 @@
 #define MDIO_PMA_SPEED_100 0x0020
 #define MDIO_PMA_SPEED_10 0x0040
 #define MDIO_PCS_SPEED_10P2B 0x0002
+#define MDIO_PCS_SPEED_2_5G 0x0040
+#define MDIO_PCS_SPEED_5G 0x0080
 #define MDIO_DEVS_PRESENT(devad) (1 << (devad))
 #define MDIO_DEVS_C22PRESENT MDIO_DEVS_PRESENT(0)
 #define MDIO_DEVS_PMAPMD MDIO_DEVS_PRESENT(MDIO_MMD_PMAPMD)