diff --git a/include/watchdog.h b/include/watchdog.h
index 1853a3a87b..d2879c8381 100644
--- a/include/watchdog.h
+++ b/include/watchdog.h
@@ -8,6 +8,8 @@
 #ifndef __CROS_EC_WATCHDOG_H
 #define __CROS_EC_WATCHDOG_H
 
+#include <stdint.h>
+
 /**
  * Initialize the watchdog.
  *