diff --git a/libs/ardour/midi_region.cc b/libs/ardour/midi_region.cc
index fe1418603e..79b68903ff 100644
--- a/libs/ardour/midi_region.cc
+++ b/libs/ardour/midi_region.cc
@@ -105,7 +105,7 @@ MidiRegion::do_export (string const& path) const
 	/* caller must check for pre-existing file */
 	assert (!path.empty());
 	assert (!Glib::file_test (path, Glib::FILE_TEST_EXISTS));
-	newsrc = boost::dynamic_pointer_cast<MidiSource>(SourceFactory::createWritable(DataType::MIDI, _session, path, false, _session.sample_rate()));
+	newsrc = boost::dynamic_pointer_cast<MidiSource> (SourceFactory::createWritable (DataType::MIDI, _session, path, _session.sample_rate (), false, true));
 
 	{
 		/* Lock our source since we'll be reading from it.  write_to() will