diff --git a/sound/soc/mediatek/mt8188/mt8188-dai-dmic.c b/sound/soc/mediatek/mt8188/mt8188-dai-dmic.c
index 4cfbcb71d2d9..adcea7818be2 100644
--- a/sound/soc/mediatek/mt8188/mt8188-dai-dmic.c
+++ b/sound/soc/mediatek/mt8188/mt8188-dai-dmic.c
@@ -307,6 +307,7 @@ static int mtk_dmic_event(struct snd_soc_dapm_widget *w,
 	switch (event) {
 	case SND_SOC_DAPM_PRE_PMU:
 		/* request fifo soft rst */
+		msk = 0;
 		for (i = dmic_num; i >= DMIC0; i--)
 			msk |= PWR2_TOP_CON1_DMIC_FIFO_SOFT_RST_EN(i);