diff --git a/components/dfs/dfs_v2/filesystems/devfs/devfs.c b/components/dfs/dfs_v2/filesystems/devfs/devfs.c
index 6db468fb5f..c8c66667db 100644
--- a/components/dfs/dfs_v2/filesystems/devfs/devfs.c
+++ b/components/dfs/dfs_v2/filesystems/devfs/devfs.c
@@ -265,7 +265,7 @@ static int dfs_devfs_flush(struct dfs_file *file)
 
 static off_t dfs_devfs_lseek(struct dfs_file *file, off_t offset, int wherece)
 {
-    off_t ret = 0;
+    off_t ret = -EPERM;
     rt_device_t device;
 
     RT_ASSERT(file != RT_NULL);
diff --git a/components/lwp/lwp_syscall.c b/components/lwp/lwp_syscall.c
index 90e881abbb..bbb0573c5c 100644
--- a/components/lwp/lwp_syscall.c
+++ b/components/lwp/lwp_syscall.c
@@ -461,7 +461,7 @@ ssize_t sys_write(int fd, const void *buf, size_t nbyte)
 /* syscall: "lseek" ret: "off_t" args: "int" "off_t" "int" */
 size_t sys_lseek(int fd, size_t offset, int whence)
 {
-    size_t ret = lseek(fd, offset, whence);
+    ssize_t ret = lseek(fd, offset, whence);
     return (ret < 0 ? GET_ERRNO() : ret);
 }