diff --git a/drivers/syslog/vlowsyslog.c b/drivers/syslog/vlowsyslog.c
index 465b63cd7bb..e3e4051617b 100644
--- a/drivers/syslog/vlowsyslog.c
+++ b/drivers/syslog/vlowsyslog.c
@@ -64,14 +64,14 @@
  *
  ****************************************************************************/
 
-int _lowvsyslog(FAR const IPTR char *fmt, va_list ap)
+int _lowvsyslog(FAR const IPTR char *fmt, FAR va_list *ap)
 {
   struct lib_outstream_s stream;
 
   /* Wrap the stdout in a stream object and let lib_vsprintf do the work. */
 
   syslogstream((FAR struct lib_outstream_s *)&stream);
-  return lib_vsprintf((FAR struct lib_outstream_s *)&stream, fmt, ap);
+  return lib_vsprintf((FAR struct lib_outstream_s *)&stream, fmt, *ap);
 }
 
 #endif /* CONFIG_ARCH_LOWPUTC */
diff --git a/drivers/syslog/vsyslog.c b/drivers/syslog/vsyslog.c
index 820c1bf1a6b..fc9b9a1b9d5 100644
--- a/drivers/syslog/vsyslog.c
+++ b/drivers/syslog/vsyslog.c
@@ -62,7 +62,7 @@
  *
  ****************************************************************************/
 
-int _vsyslog(FAR const IPTR char *fmt, va_list ap)
+int _vsyslog(FAR const IPTR char *fmt, FAR va_list *ap)
 {
   struct lib_outstream_s stream;
 #ifdef CONFIG_SYSLOG_TIMESTAMP
@@ -96,5 +96,5 @@ int _vsyslog(FAR const IPTR char *fmt, va_list ap)
 
 #endif
 
-  return lib_vsprintf((FAR struct lib_outstream_s *)&stream, fmt, ap);
+  return lib_vsprintf((FAR struct lib_outstream_s *)&stream, fmt, *ap);
 }
diff --git a/include/nuttx/syslog/syslog.h b/include/nuttx/syslog/syslog.h
index 90123e6d357..18d20c98d27 100644
--- a/include/nuttx/syslog/syslog.h
+++ b/include/nuttx/syslog/syslog.h
@@ -216,8 +216,8 @@ int syslog_flush(void);
  *
  ****************************************************************************/
 
-int _vsyslog(FAR const IPTR char *src, va_list ap);
-int _lowvsyslog(FAR const IPTR char *src, va_list ap);
+int _vsyslog(FAR const IPTR char *src, FAR va_list *ap);
+int _lowvsyslog(FAR const IPTR char *src, FAR va_list *ap);
 
 #undef EXTERN
 #ifdef __cplusplus
diff --git a/libc/syslog/lib_lowsyslog.c b/libc/syslog/lib_lowsyslog.c
index 1aa0a00f761..d86ab394ff5 100644
--- a/libc/syslog/lib_lowsyslog.c
+++ b/libc/syslog/lib_lowsyslog.c
@@ -80,7 +80,7 @@ int lowvsyslog(int priority, FAR const IPTR char *fmt, va_list ap)
     {
       /* Perform the _lowvsyslog system call */
 
-      ret = _lowvsyslog(fmt, ap);
+      ret = _lowvsyslog(fmt, &ap);
     }
 
   return ret;
diff --git a/libc/syslog/lib_syslog.c b/libc/syslog/lib_syslog.c
index 5ac55eb6b71..700b99b48c0 100644
--- a/libc/syslog/lib_syslog.c
+++ b/libc/syslog/lib_syslog.c
@@ -69,7 +69,7 @@ int vsyslog(int priority, FAR const IPTR char *fmt, va_list ap)
     {
       /* Yes.. lPerform the _vsyslog system cal */
 
-      ret = _vsyslog(fmt, ap);
+      ret = _vsyslog(fmt, &ap);
     }
 
   return ret;
diff --git a/syscall/syscall.csv b/syscall/syscall.csv
index 573de95364d..306d5c4cae9 100644
--- a/syscall/syscall.csv
+++ b/syscall/syscall.csv
@@ -159,7 +159,7 @@
 "up_assert","assert.h","","void","FAR const uint8_t*","int"
 #"up_assert","assert.h","","void"
 "vfork","unistd.h","defined(CONFIG_ARCH_HAVE_VFORK)","pid_t"
-"_vsyslog","syslog.h","","int","FAR const IPTR char*","va_list"
+"_vsyslog","syslog.h","","int","FAR const IPTR char*","FAR va_list*"
 "wait","sys/wait.h","defined(CONFIG_SCHED_WAITPID) && defined(CONFIG_SCHED_HAVE_PARENT)","pid_t","int*"
 "waitid","sys/wait.h","defined(CONFIG_SCHED_WAITPID) && defined(CONFIG_SCHED_HAVE_PARENT)","int","idtype_t","id_t"," FAR siginfo_t *","int"
 "waitpid","sys/wait.h","defined(CONFIG_SCHED_WAITPID)","pid_t","pid_t","int*","int"