diff --git a/libs/ardour/playlist.cc b/libs/ardour/playlist.cc
index 5c2193ca0c..3c9d32e452 100644
--- a/libs/ardour/playlist.cc
+++ b/libs/ardour/playlist.cc
@@ -2993,11 +2993,11 @@ Playlist::ripple (samplepos_t at, samplecnt_t distance, RegionList* exclude)
 void
 Playlist::update_after_tempo_map_change ()
 {
+	freeze ();
+
 	RegionWriteLock rlock (const_cast<Playlist*> (this));
 	RegionList      copy (regions.rlist ());
 
-	freeze ();
-
 	for (RegionList::iterator i = copy.begin (); i != copy.end (); ++i) {
 		rlock.thawlist.add (*i);
 		(*i)->update_after_tempo_map_change ();