diff --git a/gtk2_ardour/region_view.cc b/gtk2_ardour/region_view.cc
index 55dc09c17b..ae5fabcc16 100644
--- a/gtk2_ardour/region_view.cc
+++ b/gtk2_ardour/region_view.cc
@@ -130,6 +130,8 @@ RegionView::RegionView (const RegionView& other)
 RegionView::RegionView (const RegionView& other, boost::shared_ptr<Region> other_region)
 	: sigc::trackable(other)
 	, TimeAxisViewItem (other)
+	, sync_mark (0)
+	, sync_line (0)
 	, _silence_text (0)
 	, _xrun_markers_visible (false)
 	, _cue_markers_visible (false)