diff --git a/sound/soc/intel/skylake/skl-nhlt.c b/sound/soc/intel/skylake/skl-nhlt.c
index 4d2136c0389a..ca5dc2be7b68 100644
--- a/sound/soc/intel/skylake/skl-nhlt.c
+++ b/sound/soc/intel/skylake/skl-nhlt.c
@@ -269,7 +269,7 @@ void skl_nhlt_remove_sysfs(struct skl *skl)
  * stores all possible rates supported in a rate table for the corresponding
  * sclk/sclkfs.
  */
-void skl_get_ssp_clks(struct skl *skl, struct skl_ssp_clk *ssp_clks,
+static void skl_get_ssp_clks(struct skl *skl, struct skl_ssp_clk *ssp_clks,
 				struct nhlt_fmt *fmt, u8 id)
 {
 	struct skl_i2s_config_blob_legacy *i2s_config;
@@ -360,7 +360,7 @@ void skl_get_ssp_clks(struct skl *skl, struct skl_ssp_clk *ssp_clks,
 	}
 }
 
-void skl_get_mclk(struct skl *skl, struct skl_ssp_clk *mclk,
+static void skl_get_mclk(struct skl *skl, struct skl_ssp_clk *mclk,
 				struct nhlt_fmt *fmt, u8 id)
 {
 	struct skl_i2s_config_blob_legacy *i2s_config;
diff --git a/sound/soc/intel/skylake/skl.c b/sound/soc/intel/skylake/skl.c
index 63e5456ef401..a89592b2850e 100644
--- a/sound/soc/intel/skylake/skl.c
+++ b/sound/soc/intel/skylake/skl.c
@@ -545,7 +545,7 @@ struct skl_clk_parent_src *skl_get_parent_clk(u8 clk_id)
 	return NULL;
 }
 
-void init_skl_xtal_rate(int pci_id)
+static void init_skl_xtal_rate(int pci_id)
 {
 	switch (pci_id) {
 	case 0x9d70: