diff --git a/libs/ardour/ardour/playlist.h b/libs/ardour/ardour/playlist.h
index ed4ca9e0c9..ebc0e98fbb 100644
--- a/libs/ardour/ardour/playlist.h
+++ b/libs/ardour/ardour/playlist.h
@@ -435,7 +435,7 @@ protected:
 	int  remove_region_internal (std::shared_ptr<Region>, ThawList& thawlist);
 	void copy_regions (RegionList&) const;
 
-	void partition_internal (timepos_t const & start, timepos_t const & end, bool cutting, ThawList& thawlist);
+	void partition_internal (timepos_t start, timepos_t end, bool cutting, ThawList& thawlist);
 
 	std::pair<timepos_t, timepos_t> _get_extent() const;
 
diff --git a/libs/ardour/playlist.cc b/libs/ardour/playlist.cc
index 0fb2a7ec1d..6cfe91bb8a 100644
--- a/libs/ardour/playlist.cc
+++ b/libs/ardour/playlist.cc
@@ -988,8 +988,15 @@ Playlist::partition (timepos_t const & start, timepos_t const & end, bool cut)
  *  removed.
  */
 void
-Playlist::partition_internal (timepos_t const & start, timepos_t const & end, bool cutting, ThawList& thawlist)
+Playlist::partition_internal (timepos_t start, timepos_t end, bool cutting, ThawList& thawlist)
 {
+	if (start.time_domain () != end.time_domain () || start.time_domain () != time_domain () || end.time_domain () != time_domain ()) {
+		warning << string_compose (_("Playlist::partition_internal() with time domains mismatch %1 %2 (expected %3 time)"), start, end, time_domain () == Temporal::AudioTime ? "audio" : " music") << endmsg;
+	}
+
+	start.set_time_domain (time_domain ());
+	end.set_time_domain (time_domain ());
+
 	RegionList new_regions;
 
 	{