diff --git a/libs/ardour/transport_master_manager.cc b/libs/ardour/transport_master_manager.cc
index 508d677a8a..4fb7796aac 100644
--- a/libs/ardour/transport_master_manager.cc
+++ b/libs/ardour/transport_master_manager.cc
@@ -562,6 +562,7 @@ TransportMasterManager::master_by_type (SyncSource src) const
 void
 TransportMasterManager::engine_stopped ()
 {
+	DEBUG_TRACE (DEBUG::Slave, "engine stopped, reset all transport masters\n");
 	{
 		Glib::Threads::RWLock::ReaderLock lm (lock);