diff --git a/components/dfs/src/dfs.c b/components/dfs/src/dfs.c
index 4e38615ba..7e56137ab 100644
--- a/components/dfs/src/dfs.c
+++ b/components/dfs/src/dfs.c
@@ -234,7 +234,11 @@ int fd_is_open(const char *pathname)
             mountpath = fullpath + strlen(fs->path);
 
         dfs_lock();
+#ifdef DFS_USING_STDIO
+        for (index = 3; index < DFS_FD_MAX+3; index++)
+#else
         for (index = 0; index < DFS_FD_MAX; index++)
+#endif
         {
             fd = &(fd_table[index]);
             if (fd->fs == RT_NULL)