diff --git a/include/linux/mdio.h b/include/linux/mdio.h
index ec90da7..dfb9479 100644
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -10,6 +10,7 @@
 #ifndef __LINUX_MDIO_H__
 #define __LINUX_MDIO_H__
 
+#include <linux/types.h>
 #include <linux/mii.h>
 
 /* MDIO Manageable Devices (MMDs). */