diff --git a/include/nuttx/clock.h b/include/nuttx/clock.h
index db0552d2a64..ce354dcdf84 100644
--- a/include/nuttx/clock.h
+++ b/include/nuttx/clock.h
@@ -270,6 +270,13 @@ EXTERN volatile clock_t g_system_timer;
  * Public Function Prototypes
  ****************************************************************************/
 
+void clock_timespec_add(FAR const struct timespec *ts1,
+                        FAR const struct timespec *ts2,
+                        FAR struct timespec *ts3);
+void clock_timespec_subtract(FAR const struct timespec *ts1,
+                             FAR const struct timespec *ts2,
+                             FAR struct timespec *ts3);
+
 /****************************************************************************
  * Name:  clock_synchronize
  *
diff --git a/sched/clock/clock.h b/sched/clock/clock.h
index 8fe983534be..7eaf40a3882 100644
--- a/sched/clock/clock.h
+++ b/sched/clock/clock.h
@@ -102,11 +102,5 @@ int  clock_abstime2ticks(clockid_t clockid,
 int  clock_time2ticks(FAR const struct timespec *reltime,
                       FAR sclock_t *ticks);
 int  clock_ticks2time(sclock_t ticks, FAR struct timespec *reltime);
-void clock_timespec_add(FAR const struct timespec *ts1,
-                        FAR const struct timespec *ts2,
-                        FAR struct timespec *ts3);
-void clock_timespec_subtract(FAR const struct timespec *ts1,
-                             FAR const struct timespec *ts2,
-                             FAR struct timespec *ts3);
 
 #endif /* __SCHED_CLOCK_CLOCK_H */