diff --git a/fs/procfs/fs_procfsuptime.c b/fs/procfs/fs_procfsuptime.c
index c39ade3407..4e836e7e5d 100644
--- a/fs/procfs/fs_procfsuptime.c
+++ b/fs/procfs/fs_procfsuptime.c
@@ -240,7 +240,7 @@ static ssize_t uptime_read(FAR struct file *filep, FAR char *buffer,
     {
       /* System time */
 
-      ticktime = clock_systimer();
+      ticktime = clock_systimer() - INITIAL_SYSTEM_TIMER_TICKS;
 
 #if defined(CONFIG_HAVE_DOUBLE) && defined(CONFIG_LIBC_FLOATINGPOINT)
       /* Convert the system up time to a seconds + hundredths of seconds string */
diff --git a/include/nuttx/clock.h b/include/nuttx/clock.h
index 2c679deb73..d05d49a50e 100644
--- a/include/nuttx/clock.h
+++ b/include/nuttx/clock.h
@@ -178,6 +178,19 @@
 #define TICK2HSEC(tick)       (((tick)+(TICK_PER_HSEC/2))/TICK_PER_HSEC) /* Rounds */
 #define TICK2SEC(tick)        (((tick)+(TICK_PER_SEC/2))/TICK_PER_SEC)   /* Rounds */
 
+#if defined(CONFIG_DEBUG_FEATURES) && defined(CONFIG_SYSTEM_TIME64) && \
+    defined(CONFIG_CLOCK_MONOTONIC)
+/* Initial system timer ticks value close to maximum 32-bit value, to test
+ * 64-bit system-timer after going over 32-bit value. This is to make errors
+ * of casting 64-bit system-timer to 32-bit variables more visible.
+ */
+
+#  define INITIAL_SYSTEM_TIMER_TICKS \
+    ((uint64_t)(UINT32_MAX - (TICK_PER_SEC * 5)))
+#else
+#  define INITIAL_SYSTEM_TIMER_TICKS 0
+#endif
+
 /****************************************************************************
  * Public Types
  ****************************************************************************/
diff --git a/sched/clock/clock_initialize.c b/sched/clock/clock_initialize.c
index 4d41071f47..6edf41d90d 100644
--- a/sched/clock/clock_initialize.c
+++ b/sched/clock/clock_initialize.c
@@ -68,19 +68,6 @@
 #define SEC_PER_HOUR ((time_t)60 * SEC_PER_MIN)
 #define SEC_PER_DAY  ((time_t)24 * SEC_PER_HOUR)
 
-#if defined(CONFIG_DEBUG_FEATURES) && defined(CONFIG_SYSTEM_TIME64) && \
-    defined(CONFIG_CLOCK_MONOTONIC)
-/* Initial system timer ticks value close to maximum 32-bit value, to test
- * 64-bit system-timer after going over 32-bit value. This is to make errors
- * of casting 64-bit system-timer to 32-bit variables more visible.
- */
-
-#  define INITIAL_SYSTEM_TIMER_TICKS \
-    ((uint64_t)(UINT32_MAX - (TICK_PER_SEC * 5)))
-#else
-#  define INITIAL_SYSTEM_TIMER_TICKS 0
-#endif
-
 /****************************************************************************
  * Public Data
  ****************************************************************************/