diff --git a/sched/clock/CMakeLists.txt b/sched/clock/CMakeLists.txt
index b2cf2117f8..1a6b83ce89 100644
--- a/sched/clock/CMakeLists.txt
+++ b/sched/clock/CMakeLists.txt
@@ -26,6 +26,7 @@ set(SRCS
     clock_initialize.c
     clock_settime.c
     clock_gettime.c
+    clock_realtime2absticks.c
     clock_systime_ticks.c
     clock_systime_timespec.c)
 
diff --git a/sched/clock/Make.defs b/sched/clock/Make.defs
index 2f306dc166..757c983f90 100644
--- a/sched/clock/Make.defs
+++ b/sched/clock/Make.defs
@@ -22,7 +22,7 @@
 
 CSRCS += clock.c clock_initialize.c clock_settime.c clock_gettime.c
 CSRCS += clock_systime_ticks.c clock_systime_timespec.c
-CSRCS += clock_perf.c
+CSRCS += clock_perf.c clock_realtime2absticks.c
 
 ifeq ($(CONFIG_CLOCK_TIMEKEEPING),y)
 CSRCS += clock_timekeeping.c
diff --git a/sched/clock/clock_abstime2ticks.c b/sched/clock/clock_realtime2absticks.c
similarity index 55%
rename from sched/clock/clock_abstime2ticks.c
rename to sched/clock/clock_realtime2absticks.c
index 6a7b3f4e86..2aedf5c942 100644
--- a/sched/clock/clock_abstime2ticks.c
+++ b/sched/clock/clock_realtime2absticks.c
@@ -1,5 +1,5 @@
 /****************************************************************************
- * sched/clock/clock_abstime2ticks.c
+ * sched/clock/clock_realtime2absticks.c
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -35,76 +35,6 @@
  * Public Functions
  ****************************************************************************/
 
-/****************************************************************************
- * Name: clock_abstime2ticks
- *
- * Description:
- *   Convert an absolute timespec delay to system timer ticks.
- *
- * Input Parameters:
- *   clockid - The timing source to use in the conversion
- *   reltime - Convert this absolute time to system clock ticks.
- *   ticks - Return the converted number of ticks here.
- *
- * Returned Value:
- *   OK on success; A non-zero error number on failure
- *
- * Assumptions:
- *   Interrupts should be disabled so that the time is not changing during
- *   the calculation
- *
- ****************************************************************************/
-
-int clock_abstime2ticks(clockid_t clockid,
-                        FAR const struct timespec *abstime,
-                        FAR sclock_t *ticks)
-{
-  struct timespec currtime;
-  struct timespec reltime;
-  int             ret;
-
-  /* Convert the timespec to clock ticks.
-   * NOTE: Here we use internal knowledge
-   * that CLOCK_REALTIME is defined to be zero!
-   */
-
-  ret = clock_gettime(clockid, &currtime);
-  if (ret != OK)
-    {
-      return ret;
-    }
-
-  if (clock_timespec_compare(abstime, &currtime) < 0)
-    {
-      /* Every caller of clock_abstime2ticks check 'ticks < 0' to see if
-       * absolute time is in the past. So lets just return negative tick
-       * here.
-       */
-
-      *ticks = -1;
-      return OK;
-    }
-
-  /* The relative time to wait is the absolute time minus the current time. */
-
-  reltime.tv_nsec = (abstime->tv_nsec - currtime.tv_nsec);
-  reltime.tv_sec  = (abstime->tv_sec  - currtime.tv_sec);
-
-  /* Check if we were supposed to borrow from the seconds. */
-
-  if (reltime.tv_nsec < 0)
-    {
-      reltime.tv_nsec += NSEC_PER_SEC;
-      reltime.tv_sec  -= 1;
-    }
-
-  /* Convert this relative time into clock ticks. */
-
-  *ticks = clock_time2ticks(&reltime);
-
-  return OK;
-}
-
 /****************************************************************************
  * Name: clock_realtime2absticks
  *