diff --git a/libs/ardour/ardour/transport_fsm.h b/libs/ardour/ardour/transport_fsm.h
index 5a08e621d7..a939b3395b 100644
--- a/libs/ardour/ardour/transport_fsm.h
+++ b/libs/ardour/ardour/transport_fsm.h
@@ -149,12 +149,7 @@ struct TransportFSM
 	bool waiting_for_butler() const  { return _butler_state == WaitingForButler; }
 	bool declick_in_progress() const { return _motion_state == DeclickToLocate || _motion_state == DeclickToStop; }
 
-	void enqueue (Event* ev) {
-		queued_events.push_back (*ev);
-		if (!processing) {
-			process_events ();
-		}
-	}
+	void enqueue (Event* ev);
 
   private:
 
diff --git a/libs/ardour/transport_fsm.cc b/libs/ardour/transport_fsm.cc
index c9ae1153fa..02faafef9b 100644
--- a/libs/ardour/transport_fsm.cc
+++ b/libs/ardour/transport_fsm.cc
@@ -396,3 +396,14 @@ TransportFSM::transition (ButlerState bs)
 	DEBUG_TRACE (DEBUG::TFSMState, string_compose ("Leave %1, enter %2\n", enum_2_string (_butler_state), enum_2_string (bs)));
 	_butler_state = bs;
 }
+
+void
+TransportFSM::enqueue (Event* ev)
+{
+	DEBUG_TRACE (DEBUG::TFSMState, string_compose ("queue tfsm event %1\n", enum_2_string (ev->type)));
+	PBD::stacktrace (std::cerr, 30);
+	queued_events.push_back (*ev);
+	if (!processing) {
+		process_events ();
+	}
+}