diff --git a/sound/soc/mediatek/mt8183/mt8183-dai-i2s.c b/sound/soc/mediatek/mt8183/mt8183-dai-i2s.c
index c25024f72e72ec5d338d34ea07ffdf8c54b85c79..777e93d70beabb8493509531ad6d951999fcf500 100644
--- a/sound/soc/mediatek/mt8183/mt8183-dai-i2s.c
+++ b/sound/soc/mediatek/mt8183/mt8183-dai-i2s.c
@@ -963,7 +963,7 @@ static const struct mtk_afe_i2s_priv mt8183_i2s_priv[DAI_I2S_NUM] = {
 	},
 };
 
-int mt8183_dai_i2s_get_share(struct mtk_base_afe *afe)
+static int mt8183_dai_i2s_get_share(struct mtk_base_afe *afe)
 {
 	struct mt8183_afe_private *afe_priv = afe->platform_priv;
 	const struct device_node *of_node = afe->dev->of_node;
@@ -983,7 +983,7 @@ int mt8183_dai_i2s_get_share(struct mtk_base_afe *afe)
 	return 0;
 }
 
-int mt8183_dai_i2s_set_priv(struct mtk_base_afe *afe)
+static int mt8183_dai_i2s_set_priv(struct mtk_base_afe *afe)
 {
 	struct mt8183_afe_private *afe_priv = afe->platform_priv;
 	struct mtk_afe_i2s_priv *i2s_priv;