diff --git a/include/nuttx/wdog.h b/include/nuttx/wdog.h
index 4e53ca2446..30a6256a04 100644
--- a/include/nuttx/wdog.h
+++ b/include/nuttx/wdog.h
@@ -27,6 +27,7 @@
 
 #include <nuttx/config.h>
 
+#include <nuttx/clock.h>
 #include <stdint.h>
 #include <queue.h>
 
@@ -69,7 +70,7 @@ struct wdog_s
 #ifdef CONFIG_PIC
   FAR void          *picbase;    /* PIC base address */
 #endif
-  int                lag;        /* Timer associated with the delay */
+  sclock_t           lag;        /* Timer associated with the delay */
   wdparm_t           arg;        /* Callback argument */
 };
 
@@ -121,7 +122,7 @@ extern "C"
  *
  ****************************************************************************/
 
-int wd_start(FAR struct wdog_s *wdog, int32_t delay,
+int wd_start(FAR struct wdog_s *wdog, sclock_t delay,
              wdentry_t wdentry, wdparm_t arg);
 
 /****************************************************************************
diff --git a/sched/wdog/wd_start.c b/sched/wdog/wd_start.c
index 80d55e7ecd..a91cfbbec7 100644
--- a/sched/wdog/wd_start.c
+++ b/sched/wdog/wd_start.c
@@ -170,13 +170,13 @@ static inline void wd_expiration(void)
  *
  ****************************************************************************/
 
-int wd_start(FAR struct wdog_s *wdog, int32_t delay,
+int wd_start(FAR struct wdog_s *wdog, sclock_t delay,
              wdentry_t wdentry, wdparm_t arg)
 {
   FAR struct wdog_s *curr;
   FAR struct wdog_s *prev;
   FAR struct wdog_s *next;
-  int32_t now;
+  sclock_t now;
   irqstate_t flags;
 
   /* Verify the wdog and setup parameters */