diff --git a/gtk2_ardour/pianoroll.cc b/gtk2_ardour/pianoroll.cc
index 6d8a840d25..e340aac3dd 100644
--- a/gtk2_ardour/pianoroll.cc
+++ b/gtk2_ardour/pianoroll.cc
@@ -313,6 +313,7 @@ Pianoroll::pack_inner (Gtk::Box& box)
 	box.pack_start (snap_box, false, false);
 	box.pack_start (grid_box, false, false);
 	box.pack_start (draw_box, false, false);
+	draw_box.show ();
 }
 
 void