--- a/include/linux/watchdog.h
+++ b/include/linux/watchdog.h
@@ -10,6 +10,7 @@
 #define _LINUX_WATCHDOG_H
 
 #include <linux/ioctl.h>
+#include <linux/types.h>
 
 #define	WATCHDOG_IOCTL_BASE	'W'