diff --git a/gtk2_ardour/midi_tracer.h b/gtk2_ardour/midi_tracer.h
index 657f410c5d..a221152cd7 100644
--- a/gtk2_ardour/midi_tracer.h
+++ b/gtk2_ardour/midi_tracer.h
@@ -68,7 +68,7 @@ private:
 	 */
 	volatile gint _update_queued;
 
-	RingBuffer<char *> fifo;
+	PBD::RingBuffer<char *> fifo;
 	Pool buffer_pool;
 	static const size_t buffer_size = 256;