diff --git a/envy24control/driverevents.c b/envy24control/driverevents.c
index 5b5c7f2..1a79eca 100644
--- a/envy24control/driverevents.c
+++ b/envy24control/driverevents.c
@@ -37,6 +37,7 @@ void control_input_callback(gpointer data, gint source, GdkInputCondition condit
 		return;
 
 	switch (snd_ctl_event_elem_get_interface(ev)) {
+	case SND_CTL_ELEM_IFACE_MIXER:
 		if (!strcmp(name, "Word Clock Sync"))
 			master_clock_update();
 		else if (!strcmp(name, "Multi Track Volume Rate"))