diff --git a/components/libc/compilers/armlibc/libc.c b/components/libc/compilers/armlibc/libc.c
index 971ddb8d49a31b1e558a756a7d86da8e636f9a5e..889c68730955b26a2d245a614178a63f223f4d0f 100644
--- a/components/libc/compilers/armlibc/libc.c
+++ b/components/libc/compilers/armlibc/libc.c
@@ -7,11 +7,8 @@
  * Date           Author       Notes
  * 2017/10/15     bernard      the first version
  */
-#include <stdio.h>
-#include <stdlib.h>
-
+#include <fcntl.h>
 #include <rtthread.h>
-
 #include "libc.h"
 
 #ifdef RT_USING_PTHREADS
diff --git a/components/libc/compilers/armlibc/mem_std.c b/components/libc/compilers/armlibc/mem_std.c
index c350aa68fa602a26c1fa50ce729575776ab54541..fbfd17eee16632748f283d30856b1df9e2010355 100644
--- a/components/libc/compilers/armlibc/mem_std.c
+++ b/components/libc/compilers/armlibc/mem_std.c
@@ -7,7 +7,8 @@
  * 2014-08-03     bernard      Add file header.
  */
 
-#include "rtthread.h"
+#include <rtthread.h>
+#include <stddef.h>
 
 #ifdef RT_USING_HEAP
 
diff --git a/components/libc/compilers/dlib/libc.c b/components/libc/compilers/dlib/libc.c
index 097d736bfe0e7c992b41f2cca6ac7301dcc27447..f540ac955f988d6611892ffaed8462e67e51a5e0 100644
--- a/components/libc/compilers/dlib/libc.c
+++ b/components/libc/compilers/dlib/libc.c
@@ -7,11 +7,8 @@
  * Date           Author       Notes
  * 2017/10/15     bernard      the first version
  */
-#include <stdio.h>
-#include <stdlib.h>
 #include <fcntl.h>
 #include <rtthread.h>
-
 #include "libc.h"
 
 #ifdef RT_USING_PTHREADS