diff --git a/include/sys/time.h b/include/sys/time.h
index 0069de9eaa..6243cea632 100644
--- a/include/sys/time.h
+++ b/include/sys/time.h
@@ -212,7 +212,8 @@ int gettimeofday(FAR struct timeval *tv, FAR struct timezone *tz);
  *
  ****************************************************************************/
 
-int settimeofday(FAR const struct timeval *tv, FAR struct timezone *tz);
+int settimeofday(FAR const struct timeval *tv,
+                 FAR const struct timezone *tz);
 
 /****************************************************************************
  * Name: adjtime
diff --git a/libs/libc/time/lib_settimeofday.c b/libs/libc/time/lib_settimeofday.c
index 8e0b33e401..5e2e7ea396 100644
--- a/libs/libc/time/lib_settimeofday.c
+++ b/libs/libc/time/lib_settimeofday.c
@@ -54,7 +54,7 @@
  *
  ****************************************************************************/
 
-int settimeofday(FAR const struct timeval *tv, FAR struct timezone *tz)
+int settimeofday(FAR const struct timeval *tv, FAR const struct timezone *tz)
 {
   struct timespec ts;