diff --git a/include/sound/soc.h b/include/sound/soc.h
index b1e536d..50d0471 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -561,6 +561,7 @@
 #endif
 
 struct snd_soc_jack {
+	struct mutex mutex;
 	struct snd_jack *jack;
 	struct snd_soc_codec *codec;
 	struct list_head pins;