diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index fc7ce7c1b4fac394009acbd568db02c83e8549a5..54607f8c4f66ca91e5502808aa9fc94ceebc4d76 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -1151,7 +1151,8 @@ static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substrea
 	return -EINVAL;
 }
 
-int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, int cmd)
+static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
+					     int cmd)
 {
 	int err;
 	struct snd_usb_substream *subs = substream->runtime->private_data;