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-rw-r--r--sys/dev/sound/pcm/mixer.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/sys/dev/sound/pcm/mixer.h b/sys/dev/sound/pcm/mixer.h
index 52b7cbd..82e8d58 100644
--- a/sys/dev/sound/pcm/mixer.h
+++ b/sys/dev/sound/pcm/mixer.h
@@ -27,6 +27,9 @@
* $FreeBSD$
*/
+#ifndef _PCM_MIXER_H_
+#define _PCM_MIXER_H_
+
struct snd_mixer *mixer_create(device_t dev, kobj_class_t cls, void *devinfo,
const char *desc);
int mixer_delete(struct snd_mixer *m);
@@ -75,3 +78,5 @@ extern int mixer_count;
sizeof(oss_mixer_enuminfo))
#define MIXER_DECLARE(name) static DEFINE_CLASS(name, name ## _methods, MIXER_SIZE)
+
+#endif /* _PCM_MIXER_H_ */
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