diff --git a/sound/soc/amd/acp-da7219-max98357a.c b/sound/soc/amd/acp-da7219-max98357a.c
index 3c08e6e17e41..af559653e625 100644
--- a/sound/soc/amd/acp-da7219-max98357a.c
+++ b/sound/soc/amd/acp-da7219-max98357a.c
@@ -47,8 +47,6 @@ static struct clk *da7219_dai_bclk;
 static struct clk *rt5682_dai_wclk;
 static struct clk *rt5682_dai_bclk;
 
-void *acp_soc_is_rltk_max(struct device *dev);
-
 static int cz_da7219_init(struct snd_soc_pcm_runtime *rtd)
 {
 	int ret;
@@ -703,7 +701,7 @@ static struct snd_soc_card cz_rt5682_card = {
 	.num_controls = ARRAY_SIZE(cz_mc_controls),
 };
 
-void *acp_soc_is_rltk_max(struct device *dev)
+static void *acp_soc_is_rltk_max(struct device *dev)
 {
 	const struct acpi_device_id *match;