diff --git a/system/nsh/nsh_main.c b/system/nsh/nsh_main.c
index 01fcb2a6f..6a82938ee 100644
--- a/system/nsh/nsh_main.c
+++ b/system/nsh/nsh_main.c
@@ -24,12 +24,13 @@
 
 #include <nuttx/config.h>
 
-#include <sys/stat.h>
-#include <sys/boardctl.h>
+#include <errno.h>
+#include <sched.h>
 #include <stdint.h>
 #include <stdio.h>
-#include <sched.h>
-#include <errno.h>
+#include <sys/boardctl.h>
+#include <sys/stat.h>
+#include <unistd.h>
 
 #include "nshlib/nshlib.h"