diff --git a/components/dfs/src/dfs_file.c b/components/dfs/src/dfs_file.c
index 5939cd680e..15b42a2af9 100644
--- a/components/dfs/src/dfs_file.c
+++ b/components/dfs/src/dfs_file.c
@@ -532,7 +532,7 @@ void copy(const char* src, const char* dst)
 {
 	struct dfs_fd src_fd;
 	rt_uint8_t *block_ptr;
-	rt_uint32_t read_bytes, write_bytes;
+	rt_uint32_t read_bytes;
 
 	block_ptr = rt_malloc(BUF_SZ);
 	if (block_ptr == RT_NULL)
diff --git a/components/finsh/shell.h b/components/finsh/shell.h
index d810a71c0b..76b5249c68 100644
--- a/components/finsh/shell.h
+++ b/components/finsh/shell.h
@@ -55,6 +55,6 @@ void finsh_set_echo(rt_uint32_t echo);
 rt_uint32_t finsh_get_echo(void);
 
 void finsh_set_device(const char* device_name);
-const char* finsh_get_device();
+const char* finsh_get_device(void);
 
 #endif