diff --git a/[refs] b/[refs]
index 6b50dcdbb867..24bfc8124339 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3d7f1dc195167efcb269e83055672d5c0a6bd650
+refs/heads/master: 6682bb86fe1f3dba7e9cb1f0955775604599cea8
diff --git a/trunk/include/linux/sound.h b/trunk/include/linux/sound.h
index 44dcf0570432..fae20ba01fbf 100644
--- a/trunk/include/linux/sound.h
+++ b/trunk/include/linux/sound.h
@@ -1,3 +1,5 @@
+#ifndef _LINUX_SOUND_H
+#define _LINUX_SOUND_H
 
 /*
  * Minor numbers for the sound driver.
@@ -42,3 +44,5 @@ extern void unregister_sound_mixer(int unit);
 extern void unregister_sound_midi(int unit);
 extern void unregister_sound_dsp(int unit);
 #endif /* __KERNEL__ */
+
+#endif /* _LINUX_SOUND_H */