diff --git a/techpack/audio/asoc/codecs/fs1815/fsm_core.c b/techpack/audio/asoc/codecs/fs1815/fsm_core.c
index 950f4a5b1718..62579b3df4f2 100644
--- a/techpack/audio/asoc/codecs/fs1815/fsm_core.c
+++ b/techpack/audio/asoc/codecs/fs1815/fsm_core.c
@@ -1708,7 +1708,7 @@ void fsm_add_card_controls(struct snd_soc_card *card)
 }
 EXPORT_SYMBOL_GPL(fsm_add_card_controls);
 
-static int fsm_check_scene_status()
+static int fsm_check_scene_status(void)
 {
 	fsm_config_t *cfg = fsm_get_config();
 	if(cfg->speaker_on && cfg->next_scene == FSM_SCENE_MUSIC){
diff --git a/techpack/audio/asoc/codecs/fs1815/fsm_i2c.c b/techpack/audio/asoc/codecs/fs1815/fsm_i2c.c
index 00004697dd76..1582ad3f79b2 100644
--- a/techpack/audio/asoc/codecs/fs1815/fsm_i2c.c
+++ b/techpack/audio/asoc/codecs/fs1815/fsm_i2c.c
@@ -28,12 +28,12 @@ static struct device *g_fsm_pdev = NULL;
 #include "fsm_misc.c"
 //#include "fsm_codec.c"
 
-void fsm_mutex_lock()
+void fsm_mutex_lock(void)
 {
     mutex_lock(&g_fsm_mutex);
 }
 
-void fsm_mutex_unlock()
+void fsm_mutex_unlock(void)
 {
     mutex_unlock(&g_fsm_mutex);
 }