diff --git a/libjack/client.c b/libjack/client.c
index 2dc7381..5f208e1 100644
--- a/libjack/client.c
+++ b/libjack/client.c
@@ -1429,6 +1429,8 @@ jack_client_process_events (jack_client_t* client)
 static int
 jack_client_core_wait (jack_client_t* client)
 {
+	jack_client_control_t *control = client->control;
+
 	DEBUG ("client polling on %s", client->pollmax == 2 ? 
 	       "event_fd and graph_wait_fd..." :
 	       "event_fd only");