diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 2b6e8f8240d9..da9cdf5cf332 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -466,6 +466,7 @@ struct snd_pcm_substream {
 	const struct snd_pcm_ops *ops;
 	/* -- runtime information -- */
 	struct snd_pcm_runtime *runtime;
+	spinlock_t runtime_lock;
         /* -- timer section -- */
 	struct snd_timer *timer;		/* timer */
 	unsigned timer_running: 1;	/* time is running */