diff --git a/sound/pci/hda/patch_analog.c b/sound/pci/hda/patch_analog.c
index e0fb8c6d1bc2..757857313426 100644
--- a/sound/pci/hda/patch_analog.c
+++ b/sound/pci/hda/patch_analog.c
@@ -505,7 +505,7 @@ static int ad1983_auto_smux_enum_put(struct snd_kcontrol *kcontrol,
 	return 1;
 }
 
-static struct snd_kcontrol_new ad1983_auto_smux_mixer = {
+static const struct snd_kcontrol_new ad1983_auto_smux_mixer = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "IEC958 Playback Source",
 	.info = ad1983_auto_smux_enum_info,
@@ -788,7 +788,7 @@ static int ad1988_auto_smux_enum_put(struct snd_kcontrol *kcontrol,
 	return 1;
 }
 
-static struct snd_kcontrol_new ad1988_auto_smux_mixer = {
+static const struct snd_kcontrol_new ad1988_auto_smux_mixer = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "IEC958 Playback Source",
 	.info = ad1988_auto_smux_enum_info,
diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index 6cefdf6c0b75..63d15b545b33 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -961,7 +961,7 @@ static int stac_smux_enum_put(struct snd_kcontrol *kcontrol,
 				     &spec->cur_smux[smux_idx]);
 }
 
-static struct snd_kcontrol_new stac_smux_mixer = {
+static const struct snd_kcontrol_new stac_smux_mixer = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "IEC958 Playback Source",
 	/* count set later */