diff --git a/sound/core/timer.c b/sound/core/timer.c
index 67fb1ecb33f0..3d72379e57a8 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1811,6 +1811,7 @@ static int snd_timer_user_params(struct file *file,
 	struct snd_timer *t;
 	int err;
 
+	guard(mutex)(&register_mutex);
 	tu = file->private_data;
 	if (!tu->timeri)
 		return -EBADFD;