diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 448a60748523..199eb51d4614 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1543,7 +1543,8 @@ static void soc_unregister_ac97_dai_link(struct snd_soc_codec *codec)
 }
 #endif
 
-struct snd_soc_codec *soc_find_matching_codec(struct snd_soc_card *card, int num)
+static struct snd_soc_codec *soc_find_matching_codec(struct snd_soc_card *card,
+	int num)
 {
 	struct snd_soc_aux_dev *aux_dev = &card->aux_dev[num];
 	struct snd_soc_codec *codec;