diff --git a/libs/ardour/session_state.cc b/libs/ardour/session_state.cc
index c7f5a08e45..94d853fdf7 100644
--- a/libs/ardour/session_state.cc
+++ b/libs/ardour/session_state.cc
@@ -1564,8 +1564,9 @@ Session::set_state (const XMLNode& node, int version)
 		goto out;
 	} else {
 		try {
-			TempoMap::SharedPtr new_map (new TempoMap (*child, version));
-			TempoMap::update (new_map);
+			TempoMap::SharedPtr tmap = TempoMap::write_copy (); /* get writable copy of current tempo map */
+			tmap->set_state (*child, version); /* reset its state */
+			TempoMap::update (tmap); /* update the global tempo map manager */
 		} catch (...) {
 			goto out;
 		}