diff --git a/sched/clock/clock.h b/sched/clock/clock.h
index a3286dfc31fecb43be80cade93a980d64ad33a9e..cd8066615b5858c925727320a09466a7606e9bb9 100644
--- a/sched/clock/clock.h
+++ b/sched/clock/clock.h
@@ -1,4 +1,4 @@
-/********************************************************************************
+/****************************************************************************
  * sched/clock/clock.h
  *
  *   Copyright (C) 2007-2009, 2014 Gregory Nutt. All rights reserved.
@@ -31,14 +31,14 @@
  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  *
- ********************************************************************************/
+ ****************************************************************************/
 
 #ifndef __SCHED_CLOCK_CLOCK_H
 #define __SCHED_CLOCK_CLOCK_H
 
-/********************************************************************************
+/****************************************************************************
  * Included Files
- ********************************************************************************/
+ ****************************************************************************/
 
 #include <nuttx/config.h>
 
@@ -47,9 +47,9 @@
 #include <nuttx/clock.h>
 #include <nuttx/compiler.h>
 
-/********************************************************************************
+/****************************************************************************
  * Pre-processor Definitions
- ********************************************************************************/
+ ****************************************************************************/
 /* Configuration ************************************************************/
 /* If CONFIG_SYSTEM_TIME64 is selected and the CPU supports long long types,
  * then a 64-bit system time will be used.
@@ -59,13 +59,13 @@
 #  undef CONFIG_SYSTEM_TIME64
 #endif
 
-/********************************************************************************
+/****************************************************************************
  * Public Type Definitions
- ********************************************************************************/
+ ****************************************************************************/
 
-/********************************************************************************
+/****************************************************************************
  * Public Data
- ********************************************************************************/
+ ****************************************************************************/
 
 #if !defined(CONFIG_SCHED_TICKLESS) && !defined(__HAVE_KERNEL_GLOBALS)
   /* The system clock exists (CONFIG_SCHED_TICKLESS), but it not prototyped
@@ -83,9 +83,9 @@ extern volatile uint32_t g_system_timer;
 extern struct timespec   g_basetime;
 #endif
 
-/********************************************************************************
+/****************************************************************************
  * Public Function Prototypes
- ********************************************************************************/
+ ****************************************************************************/
 
 void weak_function clock_initialize(void);
 #ifndef CONFIG_SCHED_TICKLESS
diff --git a/sched/clock/clock_timekeeping.h b/sched/clock/clock_timekeeping.h
index e86613a3a44d3827b13deda378a8dd630c016d70..9bf21df743ca58d4711390f79c659a01969646fb 100644
--- a/sched/clock/clock_timekeeping.h
+++ b/sched/clock/clock_timekeeping.h
@@ -1,4 +1,4 @@
-/********************************************************************************
+/****************************************************************************
  * sched/clock/clock_timekeeping.h
  *
  *   Copyright (C) 2016 Gregory Nutt. All rights reserved.
@@ -31,14 +31,14 @@
  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  *
- ********************************************************************************/
+ ****************************************************************************/
 
 #ifndef __SCHED_CLOCK_CLOCK_TIMEKEEPING_H
 #define __SCHED_CLOCK_CLOCK_TIMEKEEPING_H
 
-/********************************************************************************
+/****************************************************************************
  * Included Files
- ********************************************************************************/
+ ****************************************************************************/
 
 #include <nuttx/config.h>
 #include <nuttx/compiler.h>
@@ -47,9 +47,9 @@
 
 #include <nuttx/clock.h>
 
-/********************************************************************************
+/****************************************************************************
  * Public Function Prototypes
- ********************************************************************************/
+ ****************************************************************************/
 
 int clock_timekeeping_get_monotonic_time(FAR struct timespec *ts);
 int clock_timekeeping_get_wall_time(FAR struct timespec *ts);
diff --git a/sched/timer/timer.h b/sched/timer/timer.h
index 6165d9e847b3d69aedc8c89535455141836c034a..a700320a390c71935753ce8a961ce17433b6011f 100644
--- a/sched/timer/timer.h
+++ b/sched/timer/timer.h
@@ -1,4 +1,4 @@
-/********************************************************************************
+/****************************************************************************
  * sched/timer/timer.h
  *
  *   Copyright (C) 2007-2009, 2014-2015 Gregory Nutt. All rights reserved.
@@ -31,14 +31,14 @@
  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  *
- ********************************************************************************/
+ ****************************************************************************/
 
 #ifndef __SCHED_TIMER_TIMER_H
 #define __SCHED_TIMER_TIMER_H
 
-/********************************************************************************
+/****************************************************************************
  * Included Files
- ********************************************************************************/
+ ****************************************************************************/
 
 #include <nuttx/config.h>
 
@@ -49,15 +49,15 @@
 #include <nuttx/compiler.h>
 #include <nuttx/wdog.h>
 
-/********************************************************************************
+/****************************************************************************
  * Pre-processor Definitions
- ********************************************************************************/
+ ****************************************************************************/
 
 #define PT_FLAGS_PREALLOCATED 0x01 /* Timer comes from a pool of preallocated timers */
 
-/********************************************************************************
+/****************************************************************************
  * Public Types
- ********************************************************************************/
+ ****************************************************************************/
 
 /* This structure represents one POSIX timer */
 
@@ -74,13 +74,13 @@ struct posix_timer_s
   struct sigevent pt_event;        /* Notification information */
 };
 
-/********************************************************************************
+/****************************************************************************
  * Public Data
- ********************************************************************************/
+ ****************************************************************************/
 
+#if CONFIG_PREALLOC_TIMERS > 0
 /* This is a list of free, preallocated timer structures */
 
-#if CONFIG_PREALLOC_TIMERS > 0
 extern volatile sq_queue_t g_freetimers;
 #endif
 
@@ -91,12 +91,12 @@ extern volatile sq_queue_t g_freetimers;
 
 extern volatile sq_queue_t g_alloctimers;
 
-/********************************************************************************
+/****************************************************************************
  * Public Function Prototypes
- ********************************************************************************/
+ ****************************************************************************/
 
 void weak_function timer_initialize(void);
 void weak_function timer_deleteall(pid_t pid);
-int  timer_release(FAR struct posix_timer_s *timer);
+int timer_release(FAR struct posix_timer_s *timer);
 
 #endif /* __SCHED_TIMER_TIMER_H */