diff --git a/libs/ardour/ardour/session.h b/libs/ardour/ardour/session.h
index 65c7e3522b..2e03c5af04 100644
--- a/libs/ardour/ardour/session.h
+++ b/libs/ardour/ardour/session.h
@@ -1525,7 +1525,7 @@ private:
 
 	TransportFSM* _transport_fsm;
 
-	static const PostTransportWork ProcessCannotProceedMask = PostTransportWork (PostTransportAudition| PostTransportClearSubstate);
+	static const PostTransportWork ProcessCannotProceedMask = PostTransportWork (PostTransportAudition);
 
 	gint _post_transport_work; /* accessed only atomic ops */
 	PostTransportWork post_transport_work() const        { return (PostTransportWork) g_atomic_int_get (const_cast<gint*>(&_post_transport_work)); }