diff --git a/sound/soc/codecs/dmic.c b/sound/soc/codecs/dmic.c
index da921da50ef0..de041369e5a7 100644
--- a/sound/soc/codecs/dmic.c
+++ b/sound/soc/codecs/dmic.c
@@ -44,8 +44,8 @@ struct dmic {
 	int modeswitch_delay;
 };
 
-int dmic_daiops_trigger(struct snd_pcm_substream *substream,
-		int cmd, struct snd_soc_dai *dai)
+static int dmic_daiops_trigger(struct snd_pcm_substream *substream,
+			       int cmd, struct snd_soc_dai *dai)
 {
 	struct snd_soc_component *component = dai->component;
 	struct dmic *dmic = snd_soc_component_get_drvdata(component);