diff --git a/gtk2_ardour/editor_tempodisplay.cc b/gtk2_ardour/editor_tempodisplay.cc
index a33d934645..81a22c393d 100644
--- a/gtk2_ardour/editor_tempodisplay.cc
+++ b/gtk2_ardour/editor_tempodisplay.cc
@@ -353,8 +353,7 @@ Editor::mouse_add_new_meter_event (timepos_t pos)
 		return;
 	}
 
-	TempoMap::SharedPtr map (TempoMap::write_copy());
-	MeterDialog meter_dialog (map, pos, _("add"));
+	MeterDialog meter_dialog (TempoMap::use(), pos, _("add"));
 
 	switch (meter_dialog.run ()) {
 	case RESPONSE_ACCEPT:
@@ -363,6 +362,8 @@ Editor::mouse_add_new_meter_event (timepos_t pos)
 		return;
 	}
 
+	TempoMap::SharedPtr map (TempoMap::write_copy());
+
 	double bpb = meter_dialog.get_bpb ();
 	bpb = max (1.0, bpb); // XXX is this a reasonable limit?