diff --git a/opendir_sample.c b/opendir_sample.c
index 5be4647..37a4938 100644
--- a/opendir_sample.c
+++ b/opendir_sample.c
@@ -23,6 +23,8 @@
 #include <dfs_posix.h>
 #endif /*RT_VER_NUM >= 0x40100*/
 
+#include <dfs_fs.h>
+
 static void opendir_sample(void)
 {
     DIR *dirp;
diff --git a/readdir_sample.c b/readdir_sample.c
index 327466c..dad1c9c 100644
--- a/readdir_sample.c
+++ b/readdir_sample.c
@@ -24,6 +24,8 @@
 #include <dfs_posix.h>
 #endif /*RT_VER_NUM >= 0x40100*/
 
+#include <dfs_fs.h>
+
 static void readdir_sample(void)
 {
     DIR *dirp;
diff --git a/tell_seek_dir_sample.c b/tell_seek_dir_sample.c
index 8d6f00c..c62b72d 100644
--- a/tell_seek_dir_sample.c
+++ b/tell_seek_dir_sample.c
@@ -22,6 +22,8 @@
 #include <dfs_posix.h>
 #endif /*RT_VER_NUM >= 0x40100*/
 
+#include <dfs_fs.h>
+
 /* 假设文件操作是在一个线程中完成 */
 static void telldir_sample(void)
 {