diff --git a/src/control/control_shm.c b/src/control/control_shm.c
index c5723549..d7297e6c 100644
--- a/src/control/control_shm.c
+++ b/src/control/control_shm.c
@@ -51,7 +51,7 @@ static int snd_ctl_shm_action(snd_ctl_t *ctl)
 {
 	snd_ctl_shm_t *shm = ctl->private_data;
 	int err;
-	char buf[1];
+	char buf[1] = {0};
 	volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl;
 	err = write(shm->socket, buf, 1);
 	if (err != 1)