diff --git a/sound/soc/sof/intel/byt.c b/sound/soc/sof/intel/byt.c
index f13179c6b047..2f5db1a8c701 100644
--- a/sound/soc/sof/intel/byt.c
+++ b/sound/soc/sof/intel/byt.c
@@ -400,8 +400,8 @@ static void byt_machine_select(struct snd_sof_dev *sdev)
 	sof_pdata->machine = mach;
 }
 
-void byt_set_mach_params(const struct snd_soc_acpi_mach *mach,
-			 struct device *dev)
+static void byt_set_mach_params(const struct snd_soc_acpi_mach *mach,
+				struct device *dev)
 {
 	struct snd_soc_acpi_mach_params *mach_params;