diff --git a/sound/usb/mixer.h b/sound/usb/mixer.h
index e02653465e29..3d12af8bf191 100644
--- a/sound/usb/mixer.h
+++ b/sound/usb/mixer.h
@@ -109,4 +109,6 @@ int snd_usb_get_cur_mix_value(struct usb_mixer_elem_info *cval,
 
 extern void snd_usb_mixer_elem_free(struct snd_kcontrol *kctl);
 
+extern struct snd_kcontrol_new *snd_usb_feature_unit_ctl;
+
 #endif /* __USBMIXER_H */
diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
index e82a72fea9a1..cbfb48bdea51 100644
--- a/sound/usb/mixer_quirks.c
+++ b/sound/usb/mixer_quirks.c
@@ -47,8 +47,6 @@
 #include "mixer_us16x08.h"
 #include "helper.h"
 
-extern struct snd_kcontrol_new *snd_usb_feature_unit_ctl;
-
 struct std_mono_table {
 	unsigned int unitid, control, cmask;
 	int val_type;