diff --git a/libs/ardour/ardour/midi_region.h b/libs/ardour/ardour/midi_region.h
index 3b75e29bbb..16c7e2d113 100644
--- a/libs/ardour/ardour/midi_region.h
+++ b/libs/ardour/ardour/midi_region.h
@@ -57,6 +57,7 @@ class MidiStateTracker;
 class Playlist;
 class Route;
 class Session;
+class ThawList;
 
 template<typename T> class MidiRingBuffer;
 
@@ -70,7 +71,7 @@ class LIBARDOUR_API MidiRegion : public Region
 	bool do_export (std::string path) const;
 
 	boost::shared_ptr<MidiRegion> clone (std::string path = std::string()) const;
-	boost::shared_ptr<MidiRegion> clone (boost::shared_ptr<MidiSource>) const;
+	boost::shared_ptr<MidiRegion> clone (boost::shared_ptr<MidiSource>, ThawList* tl = 0) const;
 
 	boost::shared_ptr<MidiSource> midi_source (uint32_t n=0) const;
 
diff --git a/libs/ardour/midi_playlist.cc b/libs/ardour/midi_playlist.cc
index 1d385fc017..1724af59f2 100644
--- a/libs/ardour/midi_playlist.cc
+++ b/libs/ardour/midi_playlist.cc
@@ -247,7 +247,7 @@ MidiPlaylist::_split_region (boost::shared_ptr<Region> region, const MusicSample
 		   since it supplies that offset to the Region constructor, which
 		   is necessary to get audio region gain envelopes right.
 		*/
-		left = RegionFactory::create (region, MusicSample (0, 0), plist, true);
+		left = RegionFactory::create (region, MusicSample (0, 0), plist, true, &thawlist);
 	}
 
 	RegionFactory::region_name (after_name, region->name(), false);
@@ -263,7 +263,7 @@ MidiPlaylist::_split_region (boost::shared_ptr<Region> region, const MusicSample
 		plist.add (Properties::layer, region->layer ());
 
 		/* same note as above */
-		right = RegionFactory::create (region, before, plist, true);
+		right = RegionFactory::create (region, before, plist, true, &thawlist);
 	}
 
 	add_region_internal (left, region->position(), thawlist, 0, region->quarter_note(), true);
diff --git a/libs/ardour/midi_region.cc b/libs/ardour/midi_region.cc
index fa963fefbd..8e3444b1e5 100644
--- a/libs/ardour/midi_region.cc
+++ b/libs/ardour/midi_region.cc
@@ -49,6 +49,7 @@
 #include "ardour/session.h"
 #include "ardour/source_factory.h"
 #include "ardour/tempo.h"
+#include "ardour/thawlist.h"
 #include "ardour/types.h"
 #include "ardour/evoral_types_convert.h"
 
@@ -180,7 +181,7 @@ MidiRegion::clone (string path) const
 }
 
 boost::shared_ptr<MidiRegion>
-MidiRegion::clone (boost::shared_ptr<MidiSource> newsrc) const
+MidiRegion::clone (boost::shared_ptr<MidiSource> newsrc, ThawList* tl) const
 {
 	BeatsSamplesConverter bfc (_session.tempo_map(), _position);
 	Temporal::Beats const bbegin = bfc.from (_start);
@@ -215,7 +216,7 @@ MidiRegion::clone (boost::shared_ptr<MidiSource> newsrc) const
 	plist.add (Properties::length_beats, _length_beats);
 	plist.add (Properties::layer, 0);
 
-	boost::shared_ptr<MidiRegion> ret (boost::dynamic_pointer_cast<MidiRegion> (RegionFactory::create (newsrc, plist, true)));
+	boost::shared_ptr<MidiRegion> ret (boost::dynamic_pointer_cast<MidiRegion> (RegionFactory::create (newsrc, plist, true, tl)));
 	ret->set_quarter_note (quarter_note());
 
 	return ret;
diff --git a/libs/ardour/region_factory.cc b/libs/ardour/region_factory.cc
index 851f877607..8933816072 100644
--- a/libs/ardour/region_factory.cc
+++ b/libs/ardour/region_factory.cc
@@ -73,7 +73,7 @@ RegionFactory::create (boost::shared_ptr<const Region> region, bool announce, bo
 
 			boost::shared_ptr<MidiSource> source = mr->session ().create_midi_source_for_session (base);
 			source->set_ancestor_name (mr->sources ().front ()->name ());
-			ret = mr->clone (source);
+			ret = mr->clone (source, tl);
 		} else {
 			ret = boost::shared_ptr<Region> (new MidiRegion (mr, MusicSample (0, 0)));
 		}